Malicious PDF — malware analysis report

Static analysis result for SHA-256 86083d5f11edfd33…

MALICIOUS

PDF

90.4 KB Created: 2021-06-29 22:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b8b7a681171587f0a494284fd16c2112 SHA-1: b6dda28a248e15ec24563af25444dd5d9efbcf72 SHA-256: 86083d5f11edfd33de5b2bb84af6cd27b221d47d1edb0cd07a5080ddeb31f88a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs confirm a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://basyapiemlak.com/yukleme_klasoru/userfiles/file/zozefegelolenerotelor.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/m9ojaic6q3fu9svaotfaaa52v3/1977139586.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b7339939---12651679935.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/manewat.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/60cfd31bc17dbbe4757a66097be9b65c/45619572195.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/5963800331.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/vupeloxokugaxekunodiva.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160824dc472405---32813623499.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/95830093341.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096efc8d97e9---visalanunovixeb.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8715d7ee---49444471082.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/jususawozezenenojigulen.pdfIn PDF document text
    • http://springbook.no/files/siwesixipukiwarupijazis.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2e9f20dfe28264d334b3edbe7eaa7f8a/jisosafexil.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d07a2d904---xuvaruf.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bc0e0900bdc7b4382148d60cc9a8a486/23772227951.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/80562597370.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e17f09ae7fc429633d560154ffc649b7/47811910082.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/56506555443.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9161992fc---fuzopamezikegurifak.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca86229c08---rorupo.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/50576951004.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a730b47c50---dorolijedelidamapol.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/10840646223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+toy+story+online+123moviesPDF 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_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 11012 bytes
SHA-256: 9939a953bb494bed5e7b904b6943d03fda88f463d9f37b581b6a6722c1341bd8
font_01_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 18484 bytes
SHA-256: 59d931c5a1c497a4622f9a26622eacd8627d3d2f10d005011434c8b081cf53bc
font_02_sfnt_off0001429c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1