Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dafa11c4d3d23d0…

MALICIOUS

PDF

91.7 KB Created: 2021-07-21 14:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82f4e94b5e0c01bd9f7ff9da93de96c5 SHA-1: 42fd1d8c83764d5c4f1ee2fb3c84fe00804ace9a SHA-256: 6dafa11c4d3d23d052c96d4af22b5af8cb771ab5436d89ac003e57568cf7c9db
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple potentially compromised websites, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 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.
  • 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 https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/904ddafba72ff432041eb060e43604a4/38403839506.pdf In PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/89217053014.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/75965026378.pdfIn PDF document text
    • http://wami.cc/data/files/3684699572.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1e7b58b651ff6bdc2d7bb4d144be140a/bagutodatuduseviwevipawiz.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/babivevimemugodud.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/29425688049.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/gukonetonasefap.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/83868707192.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/xufosizuvanijelifoxemis.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/lemegekedanasumu.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/werabi.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/ruvutabofuxane.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/xemugerate.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/86746478872.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/8629006000.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/67744844910.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/624a58dc9e52f55f07c0f9f90e04d5df/fomezamek.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd76dda3c7---bojopuxivumudaw.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/79983072589.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8f18d7dd---28110763487.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/vuketowulapise.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/65727531230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+cancel+ps+now+trialPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 18136 bytes
SHA-256: 6649eda190c3af15f076831bcf904bd56c1a8a312a144a7027cb320cd998e094
font_01_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 10444 bytes
SHA-256: a9b63babaef07afe486a459e85f611f5b540082b356102af55227672f245deb9
font_03_sfnt_off00014c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C20 16088 bytes
SHA-256: 0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf

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