Malicious PDF — malware analysis report

Static analysis result for SHA-256 760c4b36013ce558…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 04:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8adb6705a683af1c96070463924e6e75 SHA-1: 3d390267773056142b02da5d90a9b7296f734eae SHA-256: 760c4b36013ce558a0f70a744d4ea299351c7245cb976b0569864cce519504fe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

The sample was detected as a phishing PDF by ClamAV and a machine learning classifier. Heuristics indicate it is a brand-impersonation credential phishing lure, specifically impersonating Office 365. The embedded URLs point to compromised WordPress upload storage, suggesting a tactic to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=manually+sync+active+directory.
  • 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c39d826078---24658126478.pdf In PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fa04afd0---4421437394.pdfIn PDF document text
    • http://aps-mes.com/files/file/pololik.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/lazozolodurozubirowavoj.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/inn8ms1dictlgrlop9tj3jhsa6/forinabikebesogaxux.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080285fc8faa---kizewoxatojulovo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/kukomajuwawikokibiwoluw.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae810c07b5e---vewizuviwanunemipu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098502282ac0---melidarodo.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fh09c48tepf5slllr39apgpfb8/debewobikaroneva.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/rgvnokqq111f7ieauehjf47agp/67542534620.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9625bf259c---18538368469.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/85288148005.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5556ee15a---53363186494.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096627d88b4a---senixobepidabusifiwi.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/84049268068.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9d550bec---79273107750.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/5977357770.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a63383a0486---puwebixotuka.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/34685528100.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408e9b612a---wapariluluno.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8265ded5---jukubaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=manually+sync+active+directoryPDF 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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 17100 bytes
SHA-256: cbb10d0ff3052b50eb0a2376df2625ecd44c57f91bbf736d5d264b6e647cad2d
font_01_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 10636 bytes
SHA-256: e32c14f94131d05639de8f2f65ced44f8e272cebe4dbce68928e24125bb598c2

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