Malicious PDF — malware analysis report

Static analysis result for SHA-256 b880df7fd0cda4ec…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 17:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3545a7426a464c9f4e3013586698db87 SHA-1: dac6cc1ec7e9c491001b87a5d8261b3ca8517aba SHA-256: b880df7fd0cda4ec524a38d1c4ca8eaf7e32bef8f90db42f20f5141afc7ed9a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically employing a fake CAPTCHA or human verification prompt to deceive users. The document contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were directly extracted, the presence of PDF link farms and the ML classifier's high confidence score indicate a malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://zeguvietnam.com/uploads/ckfinder/files/jofubuvakipamit.pdf In PDF document text
    • https://ubranni.com/uploader/files/96684016283.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/jojidojenop.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210910001008.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630965111uQDV.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7ff7f3675f4dc7294a8058cecaa861d8/favemazebobusopenesop.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/55450876101.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/ferogosavexutidegew.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/mogijipogewimumakumumu.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/lulene.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/bnbj0okbu6eqjh271c5dftrss6/18488989926.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210909201843.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/70689026926.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/97472150481.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/votubulawenelukixowozudel.pdfIn PDF document text
    • http://poliinc.com/upload/files/zuxof.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/rolejatoxogilokug.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/ketizawokodopib.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59ac5fbad---83002422059.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/76923128886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=euro+truck+simulator+2+android+no+verificationPDF 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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 17376 bytes
SHA-256: 6e202fd03585aa383909b50a7ad41095f7f1f00186df397cf4a8501a1fe98ec3
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 11000 bytes
SHA-256: 6b9288ded491dbbb848052848ceca07f16a186c0fbe1a51b56706302c7ffb1e2
font_02_sfnt_off0001285f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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