Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91b17cf1ca38da6…

MALICIOUS

PDF

72.1 KB Created: 2021-06-03 14:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc4e2d0b9ec823fd7243eb3b68a0c978 SHA-1: f33e03ff6d546e40eab50c11e51c96a25ea80970 SHA-256: a91b17cf1ca38da653c55192a77a334234ba6791bd6b1aa3d0a1035969f38e34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document's content, though obfuscated, appears to be a lure related to flight controller software setup, aiming to direct users to these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7e9f080ea1841fdb8511463a841a1143/36608247764.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/10847036668.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f149f3442---15465465654.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160889e463c2e2---67551161551.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b0ce5d51993c0f9bfaf3d64f62fc0ace/sixugufesavelala.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e225ded4---zebogewuwilogasajina.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/93ffd7a85c765f2ceb7b056182cae0b8/nasefezimiwimapikotaw.pdf
    • https://zionapostolicministries.org/uploads/file/12258737083.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/8c4dd8e6a9cd6aa4342b8137ac11d5a3/tijijelubajadoze.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a11c90a1028bf5c76460f133446aeef9/36490002945.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1808199eb3---pokigodi.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3077b9f8---rotujafukadad.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d947dcab---25677279651.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=apm+2.8+flight+controller+setup
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd02.bin
b8fd6eef7a6f40f08f6b42a8fa268b32a6f83654f7ee7635b265f17f9f8964a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 5568 bytes
font_01_sfnt_off0000efd9.bin
baa77ecc07ab1490fcc398b2b96db481c1a50150546f1c640b51f3820ac4fdb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 10640 bytes

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