Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade18d872271720a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-23 13:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdcf77d78b6f131fc545194e5763aee6 SHA-1: 2c819caf5280f6153f85508b421ea79d12efe80f SHA-256: ade18d872271720acf675639758eb09e16215b85a8dffac19670d1eaeac8fda9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://nomylo.ru/uplcv?utm_term=tekken+5+game+free+download+for+android+mobile
    • http://highendschmiede.de/highendfiles/file/94424232327.pdf
    • http://brkvinc.com/userfiles/file/niburobuzagujatagutezu.pdf
    • http://ecohort.com/userfiles/files/92532915560.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6a3f4eb6ebed79e630152d42969cbc60/zexadilu.pdf
    • https://jordan.si/dokumenti/file/20307201522.pdf
    • https://dalba.net/other_files/File/49757101756.pdf
    • http://wahluenfty.com/userfiles/58153227206.pdf
    • http://biancoacolori.it/userfiles/files/18119240405.pdf
    • http://ncdesign.it/userfiles/files/78878173288.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa7a55252---26794667773.pdf
    • https://incoyun.com/calisma2/files/uploads/walewu.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/posisekixitavived.pdf
    • https://heureka-cz.eu/files/4799178633.pdf
    • http://proximeo.com/ckfinder/userfiles/files/68312805841.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5a609002---16476101665.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/73381857204.pdf
    • http://hasadtemizlik.com/upload/file/benimuloweviwifit.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a94771bf3---78034140484.pdf
    • https://robindayne.com/ckfinder/userfiles/files/wobemutisu.pdf
    • http://lineshare.net/upload/files/20210912160734.pdf
    • http://sprinter-lab.ru/content/File/16508053134.pdf
    • http://bestbelly.org/content/files/files/37602768839.pdf
    • https://vhssirimpanam.org/ckfinder/userfiles/files/luguz.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/ffabf2877b48baccc2a50b1def30f3ec/gukorivuj.pdf
    • http://zovsh.com/Uploadfiles/files/pafina.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161404136a01a2---betetezenizu.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_off0000b8b3.bin
ca2f70efe415bd91907da1aeb3989b6af37724e02c8d4bd4745bedb9db004c91
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B3 16328 bytes
font_01_sfnt_off0000e157.bin
69a7026065ea549e530ddc0b6fc7b2cbea9ff86bf9a12eae3430e2c97d34ecae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 10848 bytes
font_02_sfnt_off0000fa34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 16792 bytes