Malicious PDF — malware analysis report

Static analysis result for SHA-256 9858f4aa5d9a9547…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 01:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e43532a21a6ae879dc5d8e59e45cff06 SHA-1: b55bde72ea1b51477e89ce6c6940ba6d2379d21d SHA-256: 9858f4aa5d9a95471c869ee69e94570544f50a103a6f766d838f79aebcbb870d
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, forming a link farm. The SE_CALLBACK_LURE heuristic suggests a phishing or tech-support scam context, aiming to direct users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/jgfc4spe02b0cihpcist4tvidk/10124658840.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0335ea53f---11605229453.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ec96a517357ec45f932f54bdd119fd2f/97871368094.pdf
    • https://ivanamihic.com//files/xixebikuduxalalulu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999bb0bb765---20798983906.pdf
    • http://jinanxintiandi.com/userfiles/files/75422230282.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0gd1nu2v90q11bkl2bj9gknn9m/56073934286.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608489974fe58---80350163534.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ejid9aqivnf0klqi1pk5m5t3di/kaduserubisesofa.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/danesalato.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867bd9a5a99---24757443888.pdf
    • https://communeouchamps.fr/userfiles/file/36663666827.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863762a9086---70247334581.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/22741412391.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/97506011670.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090405f9e8d7---93106731950.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/67626561947.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace273dfd5d---basazugepakaxogerabe.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b60a63680---75162071545.pdf
    • http://backkwang.com/userData/board/file/tojokojozaw.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/99546803663.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/82b1d6f4427d91cd602a6555002fafc5/detufilomav.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099ddd03ca4e---13813479878.pdf
    • http://csptech.net/admin/userfiles/file/22203147784.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ios+14+free+download
    • 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_off0000ed29.bin
0e59e03f510caaf778507fb6502c13a7151a38d4b39e742dabd3bf22fda004b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 17004 bytes
font_01_sfnt_off0001197d.bin
c69d6d12e504496d913304c7a6e06d4240c708ce91389cc5c11ddf9cf011f308
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 10324 bytes
font_02_sfnt_off00013112.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 16792 bytes