Malicious PDF — malware analysis report

Static analysis result for SHA-256 43baf0fb72e2809d…

MALICIOUS

PDF

83.4 KB Created: 2021-08-01 19:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fbef721be468b7379ef984273f0d78d4 SHA-1: 8fd61473b9dc03ccdc5c12a903f0c14a7fca5673 SHA-256: 43baf0fb72e2809dd64d6e036a1101254e4f1c7bce8bff22024c5c638e978f00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gshosnab.ru/userfiles/file/nudafifanodiraw.pdf In PDF document text
    • http://icltindia.in/userfiles/file/4495124144.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/vareweku.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/63159123119.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/36004706190.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092dd31e58cc---57602040282.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50808bdf53---suxiruzezewano.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/mosadexawoforomobileg.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/81487152198.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4732545819---tabag.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/76790834918.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210717024136_3d74bz.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2996d7687043f5a6633ff65acb37dc76/xirofobulapitopokokorus.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/pemanure.pdfIn PDF document text
    • http://apple888.vn/luutru/files/72650007624.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/85637115603.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/69bbe35c49f80a268a88cbf412499435/vifikura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=abcya+40+times+escape+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 10892 bytes
SHA-256: 6c97aed1ee2bf7a49ced868304163ee28644f2e3ea93bf2669756f1b018f897b
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 16868 bytes
SHA-256: 857890ee2b5ee6524b3a619b838f6e0a55e12b892bf222085669d8f97a7eae7a
font_02_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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