Malicious PDF — malware analysis report

Static analysis result for SHA-256 192827eba4f4bd9c…

MALICIOUS

PDF

84.3 KB Created: 2021-08-16 20:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4902c020b4f79f67ddedf86ff3c68215 SHA-1: a9048a7b2073c1be0fc7b4c1fb434924891201e3 SHA-256: 192827eba4f4bd9cf544bf2987f520e4b982b548fd00096bc25cdbf01f643ac9
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to malicious websites for phishing or malware distribution. The presence of compromised CMS upload links further indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=how+to+buy+minecraft+java+edition+for+free PDF link annotation
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e62332dfb58fd63e86dc134a6d08136c/nuzezalifot.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/77858162012.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/3703445677.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4aed6ae699---46545937345.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/26440352199.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/gopefu.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/geuidqvpjh01ood87f1qsjtr11/bilezexolugujarofemol.pdfIn PDF document text
    • http://citra.cl/userfiles/file/18937281919.pdfIn PDF document text
    • http://chinalabware.net/d/files/dewetemekufotonosek.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kinuduxewirowenereruvut.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/30671838846.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/68d07caf38376985392abfdc399d4d7d/ripakitunilopaxuviwadagew.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f60125549423af7b161f0055f4a5f391/kivejupige.pdfIn PDF document text
    • http://ruihuitax.com/files/file/luzajejimovax.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r2nep9ddc5jbbgufvkclqm8k99/39054668020.pdfIn PDF document text
    • https://energooptima.hu/upload/File/78061460888.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c779d6e070---ninifigozofijogisu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1b2a945bab64616d7930fac3287878ea/zawuvetam.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/37796288885.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168e847e13e---94321390098.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/82151284673.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606efde716982---47012162224.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/636cfd5ee707c074897a9e3549d657c4/sawupere.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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 16612 bytes
SHA-256: 38e7e0cf3adbeac7460ab483b8ce555e080495ca120ab2aa69d08ebf91a5ba18
font_01_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 11052 bytes
SHA-256: fff1240c09f5200d30a2d330e6b52f5b50e8fca0917217d1582a1a8b122c0025

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