Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc2df8a56616db5…

MALICIOUS

PDF

82.7 KB Created: 2021-08-17 02:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83ad7a74222ce0d754991f19556f721a SHA-1: 5d29890d3950e2b004e85bc9764493f9a72c444e SHA-256: 0cc2df8a56616db5af3aed8f1c81bd328323055d6fff18722254696928ba2428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's primary function is to act as a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=traduzir+documentos+pdf+ingles+para+portugues PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6701b896141e5d4ba530125c824268ae/susesopopozawus.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ad895d485e7---pezuliwenitavozovejojas.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/rokudegesuvubijabepivi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4cdedaba85d11b479728dc40229fd748/fefodopo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2a32f31b---16617432958.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sd72dc1m735dtscg0uuf7as6i3/40966192299.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/kitinifudigupuf.pdfIn PDF document text
    • http://cissi.it/userfiles/files/71790316022.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/65027396951.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03ce3715a---kokarumisazomesuzo.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/62111373780.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/12alisk36f4i6g95vcfa1e6r74/9685739431.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b717127eb---13540597622.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/31568175101.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/gofapokuwugoded.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/62851413763.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe622d6e7f---xositexapelasoxumuvone.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/672244367e6b9924305c98e3bfe8b2af/90598073518.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7c2621e9---tufovedojinipewitiku.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/xamalawulikuleb.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd153b0783---38805917242.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d408e591430b8f97d615845f6362627f/wifirudezajavexofizizow.pdfIn PDF document text
    • 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 20492 bytes
SHA-256: 84c213f472a6de6156bb7caa8f4213f7f6f89e44216a095260b2469a8371fcea
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 11088 bytes
SHA-256: ece0ae67d64809f3c67287c99960e9d9413ff7a2b0ec84d468e38de5a7a314e9

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