Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a4663bdeca891e…

MALICIOUS

PDF

87.0 KB Created: 2021-09-15 10:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af35e6b62feae832bd89adf71c1ecbdc SHA-1: 779771291be515710f6e6be871445faeed68133c SHA-256: f3a4663bdeca891efd4fa51ce1455dc948cd10dc17677ab197770124430cb10c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress upload storage or disposable hosting. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick users into making a phone call, a common tactic in phishing and tech-support scams. No scripts were extracted, but the presence of numerous external links and the callback lure pattern points to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=practical+electronics+for+inventors+4th+edition+pdf PDF link annotation
    • https://rougezenekar.hu/files/file/11272156019.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/jebujizititawimikemiwifet.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d30697d0---fosanonone.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/88167908139.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/ranarivolule.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/49740044572.pdfIn PDF document text
    • https://vzglavniki.net/data/file/letumemanunonumifununuf.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/wemurezezilimako.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/4169678935.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/91424669714.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/37270357368.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/lokodiwogegazoxidewib.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/93369576541.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/13552838030.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tazokuwubagabeju.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/66758061408.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/sonezabipetawiligegafaxi.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/nowizivufozulowa.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/79846365861.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/xugovimimab.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/28152485924.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1s1qauku2tj4v5r5frd4t67ucn/tukevapigejiwadagasufelim.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141621922557---8879355509.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210913_8E2CD1C612748DCE.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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 10860 bytes
SHA-256: 188dfe081b2d0b41f7e6944addfe19403815f99746df7cbbdc09cbe4d2723a46
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 17892 bytes
SHA-256: 30fa71cd3874fc6df6cb532e32d549748ada426ef241aa48ccb5b5f7de4da293

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