Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d9d04d1e895b7e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 20:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8d96fc67f39e7452a7aa33fc5223c40 SHA-1: 0069815b6fb6df5c2c4268df5132f5da8eb84ed1 SHA-256: 05d9d04d1e895b7e54568da8fcab468103c2326012ca8bd53d12c39fb5a72857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=move+from+sd+card+to+phone+android PDF link annotation
    • http://aromaonly1.com/yamituki-n/uploads/files/16333152799.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/41549681120.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614195d9e7ace---94024118056.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/wopofo.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210901221957_n4pju6.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/nekap.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/96037635815.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca3c394d9---kigetivokowewasiforupa.pdfIn PDF document text
    • http://landpas.pl/upload/file/gizavitonabuliduselu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091914011873499.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/6411647495.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/35621002408.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/50558558881.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070554251486.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/22232946966.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/3159147875.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613861ea0ace5---jefiwutamidoxiwewigafi.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902220423673953.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/15733386990.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/niwepede.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/ligezonetomoluru.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/17703691133.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/52099944725.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/binexixositefodawa.pdfIn PDF document text
    • http://freeorden.com/media/file/4145806629.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/diwenidofudaxusebabojiwol.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_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 17776 bytes
SHA-256: 5d5683c999648f74c016da91c59e2ec8ad2a4e73aaa82ecbfc682a1338274522
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10900 bytes
SHA-256: d399be50c1e178c2a55996a7c541f12493a7122025422406aafc67686371fc00
font_02_sfnt_off000122bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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