Malicious PDF — malware analysis report

Static analysis result for SHA-256 374ae6aa66904361…

MALICIOUS

PDF

92.6 KB Created: 2021-09-06 08:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f4b58a5704c6024663c1114e59cbcfc SHA-1: 7d66b1504f7460c406bb2cc87bd3816c1ca31a4b SHA-256: 374ae6aa66904361a687b8b0fcffad837413c07e1c15cbc56f86983aa64ea337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://controlsystemco.com/cache/fck_files/file/10502939432.pdf In PDF document text
    • https://brahmagnanam.org/fck_uploads/file/ribevututibozogomuwe.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/mideb.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/vabidovikubedorazunawufin.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/60624972421.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e264a4e7---tinotosunazisofegu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8da57ff8ca759b787f55c7b396ed1891/ligidexefokozuzevakepawan.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70b1c4806e---62617549100.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/gekukinabikizajejubaworet.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/17394886075.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/sewakisijovomasezadebo.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/kemusofasatin.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/tonokuwapozu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0dd83e82f9---61122239185.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kf0f5rt332iltm5a0fgtbrf8n2/84549608721.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/lamugogofesasodilenug.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/dapibaretav.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/wolalipi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98e06605d---3695798957.pdfIn PDF document text
    • http://bienbao.net/uploads/files/wonumudademesezebod.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a10249d6fe1f1dae26dd9efaf328e957/28722205851.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/83534989139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hipotiroidismo+congenito+pdfPDF 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_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10748 bytes
SHA-256: 82d6cabfdfaaf871871ea51a3e3b74e63f2a77d0d4155ec7dba4a627cb6ab1e1
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 19276 bytes
SHA-256: 4c266010c00152ea153b8f91ab1d1544f68ad07ccd07b0778450f54c6636bee5
font_02_sfnt_off00014ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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