Malicious PDF — malware analysis report

Static analysis result for SHA-256 211c3bc1e288a1a6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 17:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59a00df6d406da076d6350aaa27224d0 SHA-1: 548f744428c1af6a0625ab322b392267653a8c80 SHA-256: 211c3bc1e288a1a6174de3edafbb1172b02635ff64fda93f1652f6f0c4243d7a
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 or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=blogspot+video+downloader+for+android PDF link annotation
    • http://gewidor-gmbh.de/uploads/files/54289711480.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/82558012621.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/80519660948.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/bajibixex.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/73756518929.pdfIn PDF document text
    • http://hkwwta.org/userfiles/dokalaj.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/77640028113.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/42016768495.pdfIn PDF document text
    • http://hflchw.com/upload/file/zojiwamovixemef.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614768fa07a65---kejamarusoxefuripe.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c82fabe8f133eb81e7e1478c21957ddc/katopidogozekuki.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bumikanolelubidaposo.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/xiwajujefotukemusoxuz.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/sebixakupubilew.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021920210288231.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147f5a684ae3---veguzunamejezesaba.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/69465500950.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/vepukiserob.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75f7998fd---81509806422.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/40559758489.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 17044 bytes
SHA-256: 088dcd4240c9f86eff4f582effa32b4fc17e2315f0c382623f7bb505120060d1
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 10880 bytes
SHA-256: 1e053f5067e977344476388ad9d98c309f484374f6659d2da117d1cc4c86d802