Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd931c1a01b46f8e…

MALICIOUS

PDF

67.0 KB Created: 2021-05-16 22:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a2f5bc39f3aaadbe65309c2c3b7711 SHA-1: e2456d5e6c2265c56dd5c52390eec3bcc8468f4a SHA-256: dd931c1a01b46f8eebcbdad7bf0a9e02795a83b5f030b1183222809cd21cdfb3
194 Risk Score

Malware Insights

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

This PDF file contains multiple links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8832

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0383de2002---gubexaf.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607807f9e4b74---modevosenis.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b774fefd7cf300878e17c2069f3e449e/23439115722.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c639b45a8---liriwes.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517a96952a---10192800624.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/eb67f83beafa8563d33807bce3d27bac/fofono.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qnlv4mnjgfaeu0n6ttbt2m1abb/risupejupidapafoziti.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g0q6qddsamq8o6crk24j2en9t6/dovik.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6e2841bf09838a24f75403d2ec8c6ab7/tujovepawexanugitimu.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080883b9b48a---lakupuvepu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9ce246b9a719b780da2862e253542123/nepuxanolukejonujivuj.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/784akqaufejrfsepbu9eaah195/62455352286.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ba679a24---xatoga.pdf
    • https://narimasu-chintai.net/jcfiles/file/69999455388.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4564ceb64---90396811884.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=river+basin+sports+fishing+report
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd57.bin
01dca072a8b0aa16d9029f3f6a0cc70690a318a08d8cad77d93c40aaa53c37c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 5336 bytes
font_01_sfnt_off0000ef88.bin
60ef6a2d1422d432d5862c4321b155f277c5f4af59d2ca1bc3d9c4196dcf00a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10488 bytes

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