Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaed0560d55cbf13…

MALICIOUS

PDF

74.8 KB Created: 2021-06-15 22:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3120a6e476d7d31062415709043d1a0a SHA-1: 2c4a2d409485433051985d75d73dd62b7a1bf314 SHA-256: aaed0560d55cbf1354f87983c9add2165a1875c61b6877a3fa74c1c0e8478ba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of these links and the overall structure indicate an attempt to trick users into visiting malicious sites, likely under the guise of a job application sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://krisoc.ru/uplcv?utm_term=simple+job+application+email+sample PDF link annotation
    • http://duoctruongxuan.vn/userfiles/image/file/14862222427.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160900d00ad147---neninoxubelexosamabovepe.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4onopjt2arhqc3oikmqt4g7ubc/nezuf.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file/%5C/2021061018471313.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609df2748c790---walonoxiwaz.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/58909107345.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/97fb1174ee0b625a575ebee4019f17bc/rikebovoxefanekixajir.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5qm5bb2jh2srhrkhmmogm74pv5/21332668274.pdfIn PDF document text
    • http://mosjob.ru/images/file/vexakefesawofazevadej.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j78m0k0r9rl19s8kooua6gl398/79172126563.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d33692179---gigewamuwowiwusedizoriz.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/97198123073.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d0792441---67585839114.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/35408031182.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/zidewuwizajixesapofibof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 5304 bytes
SHA-256: 74574e783e346c065f2592b6ab802304b5639dbd66aa71260058117646578423
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10352 bytes
SHA-256: 2649aa657afbb2cbe7daab29b237b5637e1e4efd61c59b7657cb7b38b212b38b

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