Malicious PDF — malware analysis report

Static analysis result for SHA-256 9304e79ba12576b8…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 07:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22ea59cf7fe343b33b87119578cff5d6 SHA-1: 6732bcf6d548658444114b4ad837f2b21ba46dbf SHA-256: 9304e79ba12576b8279273c2f8f64293df50851eb24b7f5a357b1d222f9da90d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=pokemon+emerald+gba+rom+download PDF link annotation
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/plnu6jv12fjafv6jjs8c1460l8/4081201282.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/ramivelozazemotimezenoti.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/84475331944.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/xatilivobonibiv.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e725e1ee8ad6322a1851c8581188a614/9737306356.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/wofelejedolasikiwatuzoma.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/gewer.pdfIn PDF document text
    • https://pellevah.com/upload/files/melilaretobixowolasob.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/ziwiporulenebaj.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/77546237407.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/linek.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161406955490e8---gelulisules.pdfIn PDF document text
    • http://jinyezi.cn/upload/40432539685.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a22531548a76903ca552c06b922b75d9/pesopitujawa.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/97471625906.pdfIn PDF document text
    • https://thehouseproduction.net/file/68324236006.pdfIn PDF document text
    • https://kar360.com/resimler/files/31901368126.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/12266170593.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614560630d0a0---lunix.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/xelulusotuzirijolusu.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/20388922564.pdfIn PDF document text
    • http://unseretochter.ch/images/file/divimeverof.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/64691998285.pdfIn PDF document text
    • 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_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 10552 bytes
SHA-256: 627da8c831f3443b5e2fbea10fb057be8da2ee4b9405af02ba24f3ccfd3215f0
font_01_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 17764 bytes
SHA-256: 10463f9e89dccbcd0a38fc45b2061ef68af8762e0a672308e80e6d7e11c22c12
font_02_sfnt_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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