Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cbba19e1b19a53…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 04:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62b6b3092fe40283a9333c585c316398 SHA-1: 81d535a3ea837589ce87515898bf7c36e5e4f8c6 SHA-256: d5cbba19e1b19a539e43c82364c9c826480295d73c5fcfcfe68fff25fb8036d7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users through a chain of links, likely to a phishing page or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://getadoc.in/ckfinder/userfiles/files/jadenivuzezavex.pdf In PDF document text
    • http://fsf-vastroad.com/userfiles/file/26877525396.pdfIn PDF document text
    • http://indel.sk/userfiles/file/82541811081.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/5545429921.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/kinetora.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/92430046061.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/rufuxutazetozititanutos.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/92182243310.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/28842772915.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/fojukofuniju.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/22e8717088b4ea5a293a5eabe50e2cb6/57711304889.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/58333701495.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/munufazapinetakojoxenel.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/rewabafuwuvitudizujasi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13cc55aa5---30884554822.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/77c97a82734fdd18a30f44edce7272cf/sesobugepuligaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=rang+punjab+full+movie+2018+watch+onlinePDF link annotation
    • 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_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 17836 bytes
SHA-256: de84cb4e9adf625d1691e107b462dbda6f57860b67e117f2fd8209dc1e5404fb
font_02_sfnt_off00011b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 11728 bytes
SHA-256: 0544884bb90205e9f16f7a0952342a9452f28fdf2ee760e02ab17dc998bd6fde

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