Malicious PDF — malware analysis report

Static analysis result for SHA-256 6982c8b5d204276c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 23:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d176106e296d4405a1571c6482d50d5 SHA-1: c12f343a50168ac7a094036556fefa79a55039cb SHA-256: 6982c8b5d204276c31dd795d185a6cb4b2988ae46fbb6f5981ca017b50da9c06
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/j0l3jmncs4pic5re22gkv3nlul/vetin.pdf
    • http://arablift.net/userfiles/file/nazozava.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/tretvqgo2f0f5o7cqd761lq2q7/68337246073.pdf
    • https://centrorevisionimonregalese.it/file/20202107237.pdf
    • https://xanbiente.de/userfiles/file/56331409514.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3325ab937a613803dd6e532b2a629159/jixox.pdf
    • https://aawyx.com/sites/default/imageuser/file/95888368792.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a1a7970cfb78022ed2da9cb2a4169c9a/54991735105.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6edfce293---bexotudejavunuxipedoduxom.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4db145a6feb95e595ea8ef8aba9b4bb3/bezibaxawilifar.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bd77407c684b2fe9c68755df38ac54bd/xelazotutiji.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8dd02b1fbf15648cc65d7ce92f298bc9/81917495662.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160cc61f9aed42---wenigesuw.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/85f3ba018a20f73e91480548c49d4f78/52958013355.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6497ed9c---84983983742.pdf
    • https://boyanbolyarski.com/userfiles/file/tugetizojazamesanezemed.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21587442a---56042640727.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8af3507847c67fc0cdb64f7d9a31e157/kowasesazowakabesifidoj.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ca47ee6b---pituj.pdf
    • https://communeouchamps.fr/userfiles/file/85891721696.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1e3363035cdb969e5488ae200da30fba/93915525006.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cc69a876---4858500794.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f5cc0f0d---situperetoseki.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a70df9c9---72636119998.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tu57ag8voujpjrraab6jkm69nr/97857195440.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+bad+seed+patty+mccormack
    • 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_off0000f1d8.bin
e84657a77f88afa29547fd9e87150152ac6955baf580a8583fe15ad44212c64c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 10844 bytes
font_01_sfnt_off00010abf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
font_02_sfnt_off000122d1.bin
7cca073ce073466480adea766ab68d149c546327cafd7c963fb5a602de04b62a
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 17528 bytes