Malicious PDF — malware analysis report

Static analysis result for SHA-256 315698c31bbb6850…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 09:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c6b68329646cf318120a54af69c6741 SHA-1: 8200934662bf8111a4ef5f0da70594e5c6070346 SHA-256: 315698c31bbb68500297939e213f0b32ebb5c3efe93791b84a2eb574b7da043c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=syllogisme+judiciaire+pdf PDF link annotation
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c3179fec71ac2556ef6e33b9e4e7a7c7/68005545428.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/157c2afaee987b82a326eb1cc5f96060/duluv.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/77676672905.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/barasipasebemediseva.pdfIn PDF document text
    • https://digireg.cn/upload/dilasudugaruragebeset.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/wajonofurenawumesetexivi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7323574d6a---31267949882.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850be79574---nimuvam.pdfIn PDF document text
    • http://amandamaitland.com/images/file/19663132532.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/30ed1c3b2c2ce006294e4e35a5f66897/mikifuvo.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/54015469793.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8e4ec389c8ac47fa2817ee7b554e285a/46377088739.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0cf3b4eabede279d7f5f37ac8df01bcd/11665185524.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/nepapataxomepixurarusalim.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/45921175161.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/rajositizosiravenoxifig.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_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 11180 bytes
SHA-256: 2cc0c0fd4f9ba1043db1f46ec73e38b8f0abaf91b8c2926d648c5ed413b0de20
font_01_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 19120 bytes
SHA-256: 2d89daa12d44063fe537867d26fed370c53cf6c3086b0077a659fb38b10f53f9
font_02_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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