Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d6df44475d7da5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 15:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd2a3672d0333d427ad084bd52f1321d SHA-1: 1e421775bb3048878e79048d374ba980aa4bf14f SHA-256: 31d6df44475d7da579ee8c1d973c1a3c886ab30ef26193a962dd74cd23baab47
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://malinaionescu.ro/userfiles/file/76867988985.pdf In PDF document text
    • https://stillwaiting.org/userfiles/file/kenonenavifixot.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/68506238481.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d352556ae4---83343263353.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/bowejepibiwibu.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/xunumokefo.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/zumizedevefid.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9a011637a5f592b88a1112929ec0cc30/75414189883.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/21718679094.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a7f55465e4de428d2fb39bbf403e3fa2/tavexal.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/96659295062.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/351d473becd0fea9b048acc8296321f0/63914518545.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/bexevesoralorizesege.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/45939862153.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/96550885242.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/regotazelazoxekixevabole.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388dead5b6d---99982835090.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/80088585718.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337c0682b0a---90422155637.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/91441209272.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/90crlp960raucbsrflgpihe20h/79634936352.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/wiwopokamufaminoxuxenoko.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/boxesasezisifofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=blur+wallpaper+hd+for+androidPDF 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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 10568 bytes
SHA-256: 9fda4416dbdab7cb096d712286b88b28d0c56530f77b4c3f73480d4997b14608
font_02_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 17052 bytes
SHA-256: 20c45d94c88786c8ccfa91125a8e9285ea4315437bb327c8eae961e5f2be9d6f

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