Malicious PDF — malware analysis report

Static analysis result for SHA-256 60999a580d7c9fe4…

MALICIOUS

PDF

91.8 KB Created: 2021-06-25 16:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4af28672d3c385e0d14f9f37e3e8cd5f SHA-1: 4cbf55c43cade35e12fefe312956c23d4826e535 SHA-256: 60999a580d7c9fe4a77fcbc8e8ba89ab116b0a476c4cc5e4a7b09d3479fe0862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92831ce82---parok.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b361d7520bf---32846341611.pdf
    • http://highendschmiede.de/highendfiles/file/47013997432.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/909798562b8860ecce7c559209ffbe86/98674465799.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d4bs0f71jqss7o4q1v6k8791c2/mavekafate.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde10c0959---dimoreguderelevofugekin.pdf
    • http://avsa.org/sites/default/files/images/files/21342135401.pdf
    • http://bhs-class1957.com/clients/35434/File/10355843497.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebfdd1fb9---pegusufulapogufupujeseviw.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b9a4b9e51---61781158623.pdf
    • http://cariboohose.com/userfiles/file/37149276598.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2ded01637---ramulaxofebetalam.pdf
    • http://el-system.jp/uploads/2012/files/nopavoruwexugozeda.pdf
    • https://lapalettedesarts.fr/gestion/file/xosuw.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949f9cda67a---11820428249.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cff8cb14b---kasak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=2400+divided+by+4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16792 bytes
font_01_sfnt_off00010283.bin
774130c1b45e2a01462877214db5d0426a9d053b2d8c652a06739d05eaaa1ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 19352 bytes
font_02_sfnt_off0001365d.bin
87ecc32f8dc62b9682335327613ede3dcd0db5c2384b9057726ee09c185f7af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1365D 9984 bytes
font_03_sfnt_off00014c9f.bin
da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9F 16224 bytes

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