Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fec11198fd28786…

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 11:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91a9e9efe6699d95c2287018b058826d SHA-1: 7a4f2befbf88e285173edf22bcab3925553b985a SHA-256: 2fec11198fd28786e338ca0a5b39ab03560a37ec5fbd591132853cf88e96a240
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://htwy.com/upload/file/dodofopirisibonemapaf.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30e04e4b68809b43849abc7b76c94f9b/tiworinowijuxu.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/p8ieq7b11a68oigvt3clnopdre/28751615814.pdf
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/42065469524.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3d044f51---28292866461.pdf
    • http://wernitznigg.at/files/bemavajogakupemusupiju.pdf
    • http://thingsantiquesla.com/userfiles/files/muxutobuwugizujukos.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c5ce4a1dc---88953060216.pdf
    • http://lor-rostov.su/userfiles/files/79147529559.pdf
    • http://globalsublimation.net/uploadfile/files/66205693561.pdf
    • http://fabrikando.com/cmsimple/images/file/53338700436.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140f06cafbdb---26186580817.pdf
    • http://piazzademarini3ge.com/userfiles/files/wupivitikof.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/domqkrjc935i4bmef7k45nnpof/85878717979.pdf
    • https://kompaspt1.com/contents/files/42767774388.pdf
    • https://abbma.in/admin/uploads/file/63155062496.pdf
    • http://donauwell.at/userfiles/file/6447031481.pdf
    • http://robbes.nl/media/files/vovaweronageguzibolimuwob.pdf
    • http://ysenb.kr/board/file/editor/file/5665737583.pdf
    • http://banquat.com/userfiles/files/bipusigelalozimo.pdf
    • http://world-spa-resorts.com/dok/rapubi.pdf
    • https://ichibaninfotech.com/ckfinder/userfiles/files/34977978985.pdf
    • http://csc020.com/userfiles/file/20210928082826_90az7y.pdf
    • https://lazerom.pro/media/file/bupuxexesigurokip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=thomas+calculus+14th+edition+solutions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E2 16792 bytes
font_01_sfnt_off0000cdf4.bin
5bbe2f23a91c0b89ea57c75e6c2f8cecd89ca7653110c5e774a64983fa53c7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 18208 bytes
font_02_sfnt_off0000fcab.bin
5afbb9a7c1bb5e8282af8c7aa3e0de7640f0447a3b2805d902bb386a96248843
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10980 bytes