Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d81af989271b6c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 03:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c9ecc2faba096f05f3691e7153c1ac3 SHA-1: 3d01795872c8f873dd4d027d4f92ecfb8f1d8cde SHA-256: b5d81af989271b6c6f440e35666f1c54473ec4605b4f937d7cac6fd55020552d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack.

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://thenext.pk/userfiles/files/16523976736.pdf In PDF document text
    • http://iseveranscopy.com/upload/editor/file/vukoz.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a890c1ee7f0---fusumapexefutomaba.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/3492219095.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/venex.pdfIn PDF document text
    • https://isosklo.cz/uploads/63530431617.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nskktant8pbsk7gk633gre62ne/48174757196.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6f5bee8819dd9a1f249316c477aaf2c3/vixixawoxaderafatami.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c17c4619---84682304291.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/70370788609.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/64733021705.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/94584486093.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/4746990710.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/srk18een46k20bvg9qkbb8vd10/50805494804.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6aa6275db---88824676539.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2ie02lfecj8pm25b6hj8uuf4rk/jofedaxajavupojejanamuxef.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/094dd9f435b6b3d2c3f8fcceb1129b01/vojawopejevola.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/marupajilimonovesated.pdfIn PDF document text
    • http://rideco.hu/upload/file/70927049105.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11294490bc---jilikux.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/miporiwab.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/bimuvogorowilal.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/leguratube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=die+verwandlung+text+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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 10740 bytes
SHA-256: 1416682cbe4e18ebff8043a063626eb796de2e4a88ce79c2484fb4a363f28bb1
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 19952 bytes
SHA-256: 48513012af5b7293a79869bc589406341441db1e560420b3bbf3ec10fa4b67c8

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