Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e7ac79b62505ce…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 08:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09ea07f5bf4df77279f1fe301ac33010 SHA-1: 03d91cb5bde1b6f72df40b1ed084218a042d7971 SHA-256: b1e7ac79b62505ce0a0e32a329eb22f589a38704e38d9ed5eb697a9cc4f16a6a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and a machine learning classifier. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. The primary IOCs are the URLs hosted on these compromised sites, which likely serve as redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0e4f01b2730359c1f22b7c560522b5fc/memivaxoposudemotojixuwi.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080460dc528c---kebosupopumovexamepijimu.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gatodabuwizetur.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edb03b11d6a---xapemiside.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/67936311996.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/165dae451856475d50976d72e91c218c/tafokof.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/mananawukos.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b6d4a90f---xaravebaxijafewikupome.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6b59b746907d69ab3610a71a8952373b/42169532149.pdfIn PDF document text
    • https://pellevah.com/upload/files/lojixerakewututazowik.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ba740dcf4---zujijobikujagiz.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/33020268465.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/995d673344fef848cf347f87f7c1e0c5/39318176660.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/takizo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c589d1f9c7---deroxaxope.pdfIn PDF document text
    • http://namngonviet.com/user-/files/31225768634.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/50326184632.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/po40nqs1em75mjv9otvcmlign0/sekejoketudezorisa.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/92157976898.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8cc687afea90cd8bb2058aba0de818ce/dejepivaxofuriwamux.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/eiolm3e191ptn9l31g3cipn8ts/fivubukazerozozuderez.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rha0o925s3qtars1s9tt78ep8m/powixarafixuzudapejap.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608756366ff8b---barazowosipixupedexose.pdfIn PDF document text
    • http://winso.tw/userfiles/file/bibisomadozoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=trainingsplan+10+km+anf%C3%A4nger+pdfPDF 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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 19396 bytes
SHA-256: 6dceba5293073a783c345b8ba256456b829b5aa757cc0b3d559cb2c45cfcc70a
font_01_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 11108 bytes
SHA-256: 49c805b6b6a4acb2b08dec4386a214cc04de3d8c17170f4965f60747743f4367
font_02_sfnt_off00012ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1