Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e85863157d622ff…

MALICIOUS

PDF

87.0 KB Created: 2021-08-17 13:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6a831f26fc193a3314e06949a711213 SHA-1: dbe5c1d42163eaa6d0649614c8e396e59ef41a59 SHA-256: 2e85863157d622ff60a088f808c7486fbfa524c659da0921853e5e86d01d9da9
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links to external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or exploit a vulnerability. The presence of JavaScript suggests an attempt to execute code, potentially leading to further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/075639d43a8808f898bc54d223defadf/dinepevotexizodi.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/nvd36in97houtb7p2vdgih94r7/78065305458.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0260165ddd7b4d68491e4abb0765fb47/73553063573.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6dc0edc73008c8b3ec82439d5ebbc2e8/zoxojo.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/53543718035.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873349d0c2---labanasadigos.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/gokuxugodulijif.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rta1vdhmgh2v35dt7jh83ooeq5/91789680815.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073de7ca07f1---68617991045.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/g2chh2q8r4ns1c23ql0dd4umb6/fovegugajupokivugekizet.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/kixiwuxe.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/mevid.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8703cf21a31cc88a1be04c0a76f46b53/17100116313.pdfIn PDF document text
    • https://olterus.info/contents//files/33448480282.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f72f7939e2a---88013119645.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/q31b9nkkrt4nri7vmqqtgt9epd/64258286655.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca28aa5f58d---37814011338.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210811_36174A150081A12A.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0cf24bb68---wudimitebug.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaluvofijifatetogujodulu.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/54486493327.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/97035280540.pdfIn PDF document text
    • http://yanartextil.com/firma/files/70079904991.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9df057276---jowabugulomikovipe.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/30856736545.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/vokitetirukasali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=driving+test+questions+and+answers+pdf+botswanaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 17620 bytes
SHA-256: 7580ac34fbe21c0fde346d1cee72a0d26f1f319537b69f130029046486467ef2
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 11168 bytes
SHA-256: 3101a5e771e4bab06e9ec9487a3a17fb8b6206b68df4908f2e2aa01f97f6d3ba
font_02_sfnt_off00013523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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