Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca7204b30a3e4a8…

MALICIOUS

PDF

82.7 KB Created: 2021-06-22 19:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b74514ca81412eb6275200b646b4f20 SHA-1: 228fdcff2cf33c766b001c492bb7376739fb4c42 SHA-256: 6ca7204b30a3e4a8b7acf410bbca281c400bca02616cfc378911c584ce426a66
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that this file is likely part of a spearphishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=victoria+o+magnum+mysterium+pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a8c8181f0e58845461136f99fc8a3e9c/ratekoruzusowa.pdf
    • http://akcjonariusz.com/UserFiles/file/58222398763.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5281ec270---71881219195.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607157d783646---40840213653.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mk2hitjg2g0ii0nln76ecu2dql/moposigemixufejufivip.pdf
    • http://drironcat.com/images/file/85790702337.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/lu1jsg3umo4cqmbbau1mhhstn6/bomularusufuwexazuva.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4a535c22---weguxezururimikoxakarum.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/b37bc598f06dc49fa1d1d53d338cb18b/tomugifevusovedasi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609020be347d4---tadimaduvuxufuxi.pdf
    • https://signika.pl/Upload/file/baxelumuvij.pdf
    • http://niezapominajkowo.eu/userfiles/file/6809092402.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074728bad906---sadekemebonomi.pdf
    • https://amitadevnani.com/userfiles/file/duzusijemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • 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_off0000eca3.bin
9f857d1e8bc81e7d9ca0560fc3272d0a0f3d61002b6589aac7251620b3a499ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 5512 bytes
font_01_sfnt_off0000ff5a.bin
1d3ab28fd729257acbe3ea0d32d0b73b5bfa09abf49d24668e675cafb39e5a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 12440 bytes
font_02_sfnt_off000127ad.bin
2e0ba24c2d525d7ed79cf712baa4eeb840960fd09d74dc9047e4d86afbd2b5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 16184 bytes

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