Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb6e1b454671eff…

MALICIOUS

PDF

101.7 KB Created: 2021-07-30 21:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 63297cdda69ccede3c4e4fe2cd84338b SHA-1: 08e6b59d97ae24d7e1638082f8818fc04e18e2c8 SHA-256: bdb6e1b454671eff8cad4ebfcba71a3688acdf74aa4d13ce38b119ce123f5b28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gesundimjob.at/images/content/files/20034435802.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0bdf78061f470df4fd0c1669fb80e36f/nejanamadasuzowuxus.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/32d1589447fc397c840f20eedd48c017/62779834620.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mhl3t0qqtus98o5j8bnun5u1jq/47096574923.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8304322e8c---jetipodideduradu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/jenorurudola.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608441f37b422---feragekirexuse.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/laxedonokaguzetakopux.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/33061879213.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/vutubinidori.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913c367aefd---jobinirurobib.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/93736569354.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/15332566760.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bf1d403c70f35b8e91ed9de80ffe2749/delojisulofosajufumikepag.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8168659f7a3b206059a29989132eb693/30857568120.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9e836c65---54307722310.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca74c1bb75b---zafed.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/50752112471.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9fe2e7d8---95362421263.pdfIn PDF document text
    • http://planetamama.ru/files/file/86485463461.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tewodenusewomunaxi.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2ce830ee111328ad6e14d9094fda1f73/8476623625.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///743922790.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609878a969f52---10255497372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+theme+of+the+adventures+of+tom+sawyerPDF 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_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 10932 bytes
SHA-256: bd193b0aa5ab9443322685e93ebec95ed55e3d795b5558a6e8bc904e1a86373c
font_01_sfnt_off00013b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15393 20676 bytes
SHA-256: 02a44a72ee66a57069c1fb694e2d83c0436e7d6b51af0ce2b59503562fa2eac5

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