Malicious PDF — malware analysis report

Static analysis result for SHA-256 536c304107de73b7…

MALICIOUS

PDF

90.4 KB Created: 2021-08-18 16:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d5f60441efdf6abc891ace7bc53c022 SHA-1: d033c7d41c48247f17a8abe7dc81b1e9e4cea076 SHA-256: 536c304107de73b760f766464a77e61ca3900d78bb6098885a451c5b1585ac27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure itself does not contain readable content, but the presence of these links points towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://grandviewheightsalumni.com/clients/79364/File/ratoxadejowim.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mbbqa0llqg0o2smek98fgq442u/watuwekisibo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c796ad8d658---14717433314.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kedapadi.pdfIn PDF document text
    • https://renault-service.com/userfiles/nalopuzurede.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/qidot0ueb03j7u0fb0i8sapbec/39674597350.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/15621974931.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mhfko0ddmekbc1ech43a55l7g3/rosukonowirezosozotajezi.pdfIn PDF document text
    • https://mcsfood.com/images/file/logenaniwoxejavewutivo.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/35850769983.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/82010038305.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/cb9834c67b3d5920e854ac2f8ce5e683/88888865177.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca9bb56644---xomukuzoroduvoza.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vobawonowegobu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dae5e6791---kowesigilonurepenim.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/xedakevopufefetikapiwak.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5a2c9f5a0cc2a45f6682dfd0ef44cda5/puluminizekawoli.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d50164ee681---97609766924.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/6274810060.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/4bd87b85cb7fef6a39f2b57862288313/43761305539.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/45256a975f2e7222c3988b7025fdbc07/45937694024.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5d3705736e7c4ad31450c319130a76ec/bupivomogukuxa.pdfIn PDF document text
    • http://halmar.info/userfiles/file/11136274417.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a63be5c86---devel.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/mopokejaz.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cbko33h20rsbj0q3lr6eor90g8/kilodumolazorawokepopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=complex+numbers+polar+form+to+cartesian+form+calculatorPDF 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_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 17336 bytes
SHA-256: 1faebe3ff39aabac1617f2c5349c60259ec2a0a34cb262c4b697c8bf8f0d4595
font_01_sfnt_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001406b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406B 11012 bytes
SHA-256: 5a724abe094176d18f22f5c6ab2cb3618015af30dcac5090c659984468b7deef