Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92b52f9ccf63443…

MALICIOUS

PDF

96.0 KB Created: 2021-06-25 15:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6304ddde77c947103a96bd603cda2248 SHA-1: 87683ee206059931bb0ac2b951953fc183fc8ea7 SHA-256: a92b52f9ccf63443f793e3140805ff073b2c79d2c03e040c6411d1497a4853ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing. The 'SE_MFA_LURE' heuristic explicitly identifies the document's intent as harvesting MFA codes or session tokens, consistent with credential phishing. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://akcjonariusz.com/UserFiles/file/36521048451.pdf In PDF document text
    • http://donateagift.eu/userfiles/file/jepoju.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/junosapokanovili.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/26660854612.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/46920751722.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/85859702895.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b095e6529b3---wekuluxo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89544e9be---88351722249.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0690b48ab6---fogapumudobusaduvot.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a85e4990---tawinez.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/39308422287.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/22405669455.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/61964708190.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/2420246572.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd9fc99e5---pubugok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=everts+ranch+shih+tzusPDF 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_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 10368 bytes
SHA-256: bb0024c5af30fe9cb46d25d0ea4446e92d1e5ef1444547f7cac73e1c90c57b3a
font_02_sfnt_off00014209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14209 18880 bytes
SHA-256: ffc2363c0bfd78e505d35bae342205f109c189f9337e467c0d133e145bc15126

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