Malicious PDF — malware analysis report

Static analysis result for SHA-256 d784d6e30dd06bac…

MALICIOUS

PDF

70.7 KB Created: 2021-04-28 11:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3ce906de3a03f36b5fb1f3dedb9bf66 SHA-1: 603ff739d041aa4d1fac1c535492da7e26b3353d SHA-256: d784d6e30dd06bacf48b5fc628137a2b98eb270d80bb005501afb12ae1939c0b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to host and distribute malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of compromised links point towards a potential phishing or malware distribution scheme, possibly leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e887d06c87---87533291900.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/s7iehgf296ptnjok1qt9nf3mb6/8104376648.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b335ddd50---83841891679.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/as9mh9qk3il1vl2bt1rlivlt15/16066763386.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c6f2bb3b94a868f41fcbc87903367075/vatopaligodatejog.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83b6b8e19---59875410225.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724fbf63533---katelifododafi.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e0bc4401---53228708219.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608387b92d0ac---woxedupeko.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16074b5c9a5b48---82079210550.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a3b787e90e999c76e1696237793da63c/pakebaxilit.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kec99bleiqdmsfkd1ftilpm3pa/pujezul.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160852f63b995d---fogedefojemidemon.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e28b4f52---xavufolezosadatu.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/61e44888871978d68512a4ebf4b55a53/16329085615.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=employment+registration+form+examples
    • 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_off0000da18.bin
2d6bb341c4f5b5724d47443aac582c3ad681a76b8febcabdaa11f434dc6271d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 5348 bytes
font_01_sfnt_off0000ec48.bin
32d8abbbbbecd00ca2770b9ec26b4e5602534f6139d1d5ec724b2e6028cf430c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 9956 bytes

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