Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb076f86d8f2d7e…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 14:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fb6e0451d84fc6df6d1912081ecf07a SHA-1: dc4f453134bbe8e81b674cd7c2202deeace04d64 SHA-256: 3bb076f86d8f2d7e24a51d09f5b9e4c967a86c4daed28c592425e0ff399689ad
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic firings related to link farms and compromised CMS uploads point towards an attack pattern focused on directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • 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 http://train-in-japan.com/images/blog//file/87555858180.pdf In PDF document text
    • https://cobaltinc.org/userfiles/file/30138465696.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m88g71ik0n9na7j17og8pashv4/metekuze.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bcc08af4b---zafiguveboti.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/ruwifolorubige.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/915143435e355ce213368d5f121540b2/luwugagalesotaxitisinav.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/18847392128.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/30244535457.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/fabomufobixufepode.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/3678409896.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106873e5dae1---92871198944.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/31430360837.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5cbc9793a---18091727162.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/kimadotunufujirudubojire.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d829c1c2f---voxeputuxoluveluni.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/49638905534.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161290065e5ee7---zidaburanobelozilulonojeg.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/89383293073.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vrb1iiph4ha4hc0g7ujio8n5cn/xukodakam.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6baaff30---zelutujukunetugiguna.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/juvemugijabodewilekosa.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1445e5b031---76701090727.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/fozen.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1da61f3e05f94b5d60e6028b7b15a1ae/dizex.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/fefoforasofidokapuzawidi.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/3651328137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=self+reliance+poem+questions+and+answersPDF 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_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 17864 bytes
SHA-256: 0b0be9f2b7205d620de76af05eb008b2eea2bed3932dfb49f721f7dc5c18a853
font_01_sfnt_off00011fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 11188 bytes
SHA-256: 1342d546f0fb588df660b13f5a0e7afabc7a5ccf66f95a23d9629d4bd8d0a8ea
font_02_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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