Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b29b42ca4caff3…

MALICIOUS

PDF

91.3 KB Created: 2021-08-12 10:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a90d1aee26a7c698bed84e49a96a393 SHA-1: 9c9244054234956d0300e29c9da259a6ed40db5a SHA-256: 33b29b42ca4caff3988a7191d894f929dabedf4cfe3aed5bcd8fef2e095118e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous URLs, many pointing to WordPress upload directories, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=eddie+bauer+car+seat+assembly+instructions PDF link annotation
    • http://tcsm62.org/uploads/news/file/genogupozu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f508bbab28---vazerubenupatasin.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89ddb448b---63523103087.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/vebupiwe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160970f1c5ace6---58242598171.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bdc5c9ad6---fumojegemiduvexobediweli.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1r0devm696rq9sfbo1c6a8akli/suxofipunadofafirutupad.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef101c745---nilofizufegikib.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/72ba208456e54a7471fd0314fdd6fd30/sasupipixupad.pdfIn PDF document text
    • https://beaszemin.com/files/pomulobamox.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/degomilipi.pdfIn PDF document text
    • http://congluc.com/upload/files/9294885509.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/12015476198.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acc096a82fe---61215597553.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a58619e1---70671698862.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/90499701211.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ca1d2051---pajovuralavodopadu.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/viliko.pdfIn PDF document text
    • http://tele-video.ru/upload/files/53790490839.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/dc8f73cbb9a6054671186cf84b7ee1a2/1549963426.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/dekuguvebusaxo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f544bbde4a389e31dac9d5e21a0414a4/31862358392.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/43286792701.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_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 19008 bytes
SHA-256: d997663a41d8556f0d8ed7addb867578432117062038c0e196f2e64a99b35b45
font_01_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14696 10868 bytes
SHA-256: db6a82afed793d0c88b0318799cf7f5c98c1c8630f6eef85ab36f7c71177f83e

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