Malicious PDF — malware analysis report

Static analysis result for SHA-256 da197fce8b73a587…

MALICIOUS

PDF

72.0 KB Created: 2021-10-04 08:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e415115096f7b3a259e5ca2e07db0a4 SHA-1: 685b6635227932a75539e7d193eb23858061b782 SHA-256: da197fce8b73a587add5b06ee767d01a1b2821df37684218faa624bf9c714807
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://crysiq.ru/uplcv?utm_term=special+order+accounting+questions+and+answers+pdf PDF link annotation
    • http://nghiencuuykhoa.com/uploads/userfiles/file/76925429625.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f174b4d959---jibezipezufuwotetuloni.pdfIn PDF document text
    • http://18554080.com/userfiles/file/luweregowan.pdfIn PDF document text
    • http://fxlcd.com/upload/file/54598769446.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///48762084388.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/dakenelamugobi.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/65091911758.pdfIn PDF document text
    • http://i-physiology.ru/upload/67339943757.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/kiniwirewofemuvekaja.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/89265545035.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6b893dfd---31129894598.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/67991056811.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/45812115556.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/37055440443.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/203676197.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/joworonivemitigoxowape.pdfIn PDF document text
    • https://theurbanthinktank.com/files/nutemopifetarifudosuzo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a388b1896a383c25eebb34b4f3b22c4e/19153030972.pdfIn PDF document text
    • http://orlickachata.cz/files/files/32046340664.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/fisozesosux.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c86da7f04ddc0e77610e0207ba0fe103/monujunurezo.pdfIn PDF document text
    • http://www.520amis.com/upload/files/pewamisigud.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/pamabebigobu.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/40088796002.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/pezofobuxofuzidi.pdfIn PDF document text
    • http://reflita.lt/uploads/files/19936792095.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/vopasibokije.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/34630020508.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_off0000b5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EB 16464 bytes
SHA-256: 682f138419dba6ddb811d116612658ae988ee6fd6157bdab0c32aea0b327ec9a
font_01_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 11204 bytes
SHA-256: 27762e0640bf8f3c51be00fc849bffc2f8fb4f4690daad7ae599a8b45057b61b