Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fad0a7ac1e5d642…

MALICIOUS

PDF

131.8 KB Created: 2021-08-06 20:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c902a14f125304050a6ffab3b1034b1b SHA-1: 8026ac3cce3d8ea3116f30b823973e52d0a07e86 SHA-256: 7fad0a7ac1e5d64269c72fe602ed8712c7a0847f7bfbdf805b8cbf4bf9dbf435
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

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 https://gizaviation.com/uploads/files/pozatupowede.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/29425308612.pdfIn PDF document text
    • http://kasargod.net/uploads/file/42970495068.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751c66666f8---jafifizikoxudowas.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/lafivon.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5b2c28b5562491afc0d9b32f1a952cb0/kojabitem.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/majoxumad.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/43540888576.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/de754f6ae1f9df7ce7c8f78cbf802cce/wubizi.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/1214737654.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/84567507417.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/878678a2b843e3d70fbc01b322f1d98d/zedenaxiwedorub.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/55461898356.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/retepamamedubodiva.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6vlu8jo6j1oss28gvdgpjm9cu8/vefevakajas.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e1bcceab---kepun.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/63538381746.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e2e27d84f---sumolejubezeta.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/81850817114.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210805_5340587390022AE5.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a4fb032a1975c25a4c0edefc0124a555/nironawebimami.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/81272241536.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6376829e80---vapuwokena.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ee45028f---41634942058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+pokemon+showdown+team+2021+anything+goesPDF link annotation
    • https://www.youtube.com/watch?v=Ye5TV9pa_4Y[In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190A1 11332 bytes
SHA-256: fcbf37addf9afa63b0685f8f6a40ca6f3e03d2ee3a47944d7591d8f5ef5fac71
font_01_sfnt_off0001ab1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C330 17760 bytes
SHA-256: a6d662dabe213eacdaec7f1a0266d5fe4a54479b29b6e0ff6f731039e8ae61c9
font_03_sfnt_off0001f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1BE 3540 bytes
SHA-256: bfe94b1bda0e4a3760a4ddddc5966387ac06c7969b5230efd98395502f969902