Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc925ff7f85ba80…

MALICIOUS

PDF

82.1 KB Created: 2021-06-16 11:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 84112875ceed42f7bfc9c23e40b1c5a8 SHA-1: 8cab6cd542be258fbea96d4d73d1d66d62f4d5e5 SHA-256: 5fc925ff7f85ba80eccc5ada28ce5743d3e1bd0420d82bad367449cc1f2e84c0
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=jesus+vakyam+wallpapers PDF link annotation
    • http://bogelaipigeon.com/upload/file/64662156820.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/r02nu2r4eokhsce19g4438n2v4/favogulixoxadudogapiluta.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sugixiju.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160829b22a8773---97891152090.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6e109347f523d61d9a2ee904337139de/92256207416.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160827241c150e---77127240399.pdfIn PDF document text
    • https://cristalensi.com/public/File/lojopepatofaxot.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0d61260efb591f5344bc57865d4aa761/loximezenavifanizafikusu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zafojunilerikorojiwexu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c50dfa2f12f---geziki.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/subuwagalutobasapuxulus.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/34919959709.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f354c6200e---nuzezax.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/somudamis.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/dofozodeledivexoxafewagi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53e16755d---likuziliradik.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/38605369234.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838323be9e3---zukokaburewog.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_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 5272 bytes
SHA-256: 4ecce471e2a1c64b7e94b58266267b41a0bac29e57d024f0e5a13aa57a266dc7
font_01_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 10268 bytes
SHA-256: b4aee1f19e9395dbeb8918e2b04882b4df69719bdbbb9bf78fb37a4846c414d4