Malicious PDF — malware analysis report

Static analysis result for SHA-256 c743df5856ea17b7…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 07:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0c8b0d26fc40477dfd7da2056be17c1e SHA-1: fd52ecbcc358d8bd402a53501d8f276ed48a6073 SHA-256: c743df5856ea17b7adbf30de90050a31f508ba71060b9cf1469854a7c62014f6
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple URLs pointing to potentially compromised CMS upload directories reinforces the likelihood of this document being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8024a44e24---zuzafomugoxinefozoj.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6235522e71f0bbcb986ab182ace28d91/zusisedo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2a69d42a912b70a6335309304d458718/romirimobupus.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9a4155eff593b87f0a27a69e22ebd46f/45486172812.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4501067c---62715739182.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c268040063f---xiwivinikup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e1d7625bf---muwig.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/resunutegekumiduzi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607879d69220a---35084151227.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jo55v1upemj7tohqmf4e4phsft/88213673313.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31464885f---wiwewumawedegegil.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a730df55b---28391510050.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/dabuxazasasutikulelaver.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cd8d0659d0f61985aa4dea8082f75d91/wavugurupusezonodurek.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/65oipdd8ik5iikev75qvogqal4/kesafevofezo.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ba8b728601aea5d757e18c99670a8a2d/85542987491.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/57908397901.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zanulodavezewo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c766d38adb---paxaradorunisel.pdfIn PDF document text
    • https://ikima.fr/uploads/file/13369918039.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a61c1dabf0f07132d8903adc73336c5f/pubudebu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-21/20210621071634540641.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/96452246390.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2612ae6a4b---kiludoxagubaxezizekufel.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10912e77c---89822525106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=boiling+point+of+water+and+melting+point+of+icePDF 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_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 18052 bytes
SHA-256: 1ee544f543cbe832c80b7bd428fa1d69fada78ba7e55a888a21ee4a0ff3d5e06
font_01_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 10936 bytes
SHA-256: 3d51f6ffcbcb5c7f61690fd0fd5223167e8f59889ac9741da72d9e217429b1df

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