Malicious PDF — malware analysis report

Static analysis result for SHA-256 483151d50bf075bd…

MALICIOUS

PDF

83.5 KB Created: 2021-08-26 13:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 563ca54832b6e8883a2387d56232813d SHA-1: b82a2d888cb728af0bd1bc0ac60d1a7794014bf8 SHA-256: 483151d50bf075bdf05aa2be90972844ee42b35191ce5e7c1313d57b7ad2e3cf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://orderpoet.com/ckfinder/userfiles/files/49398207709.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/fc40qdcpoi42222k41kljt3hn2/7719639539.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/temogumubudapezozera.pdfIn PDF document text
    • http://terminsk.by/pics/files/60008335277.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/84415484092.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7b1s8s6f3da0ea66t4a4k9p3r0/36651457097.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c97cb3f8f---19416514619.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/080309097370.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210810045158559341ttdmyp78esze.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7f098296afc061bcc6f45d5ef172ad4a/dakosate.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/latijuzikebevenavip.pdfIn PDF document text
    • http://northcity.rs/slike/files/jeworuz.pdfIn PDF document text
    • http://amandamaitland.com/images/file/mafajokireri.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/16567351721.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af644d9a1c4---71945139262.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3a680cf61---paxafifiridixaronavata.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/piguwabulezugem.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/cf7bd71915b040196fd9a13c6b493044/mitetajezazerinibukamij.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b757ca7c33b---fagusimarofovigi.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/73020528740.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/gizodititiwe.pdfIn PDF document text
    • http://soupworld.de/upload/file/41343299591.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/937c8c8a4a2741ceefd3f22d29d4c41b/vonukunip.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a7197d3a5---mefowizokonevuditagokawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=get+chaturbate+tokensPDF 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_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 10560 bytes
SHA-256: caddfc1ccc2764bb484571fc61eedc37f029f12e6f9bb83ab9517f3ae21eff6c
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 17140 bytes
SHA-256: a8e5ba4c7a46c5ad786ce1cefdaf9d1758f32f27d0c2d998fddbd70ca472e389
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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