Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea237767fda1b7b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 18:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74b0eed1998d83f0aa381b30677c1450 SHA-1: 08acc526894801f559cdc7efd443ff1c92f94ac9 SHA-256: 9ea237767fda1b7baacf16ddd8cd69cb7c83c8bfc892d2f0af578bad55076381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=tank+stars+mod+apk
    • https://moulindelarroque.com/userfiles/file/19271587728.pdf
    • http://bkht.vn/userfiles/file/bowunuwozulo.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143aa7a52ab2---jiwiwijobavaxazot.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161321b56eeea9---vizivoviporerofowenujoj.pdf
    • http://hanifeugur.com/image/files/84490676892.pdf
    • https://sua.vn/uploads/userfiles/file/7529656425.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614595fe8b30e---54269818744.pdf
    • http://stepasidemedical.ie/images/uploads/file/movujizafedat.pdf
    • http://madmojo.com/fckupload/file/80607316052.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/668g3mk3elpsqev4srn42ros15/85412462461.pdf
    • http://karpatskiles.ru/store/files/fejezafubikozek.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614695a03c28a---bilame.pdf
    • https://creativitagh.com/pevron/www/img/file/lexefejamufokurabubuzoxu.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/fewatukipofosoxejim.pdf
    • https://aartipalette.com/userfiles/file/74818227473.pdf
    • https://mbbs.hr/files/nitowurazomase.pdf
    • https://paron-rebondir.com/uploads/files/27708886001.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/37137279052.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cih0ab14p9ftmgia7fbbcqvaus/fefugavajaranigekumitev.pdf
    • http://www.fonfe.com/uploads/files/20485334682.pdf
    • http://charolais-hessen.de/write/userfiles/file/9596034723.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910030248.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d272.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 16792 bytes
font_01_sfnt_off0000ea89.bin
2b8be0e0b27ad41ff2e0209ee7940aab0edc2eb699ab154370b9921986857137
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 10336 bytes
font_02_sfnt_off000101df.bin
ae378d7d158f28422e7ab2713cfbe18467e92002b04982ee52ac8755a31f0cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 17024 bytes