Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bac7c95f46ed3d7…

MALICIOUS

PDF

75.3 KB Created: 2021-05-21 22:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 22480e6f6595a24690b4c987fb17def7 SHA-1: 3ca2310944a7c6cf193ba255e8942156c0e36ac2 SHA-256: 5bac7c95f46ed3d70a604f8698b44acc6c3736cc33c23a21ffe257fe38b3ae72
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. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though partially garbled, appears to be a lure related to a prayer, likely to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=oraci%25C3%25B3n+de+agradecimiento+a+dios+cortas+en+ingl%25C3%25A9s PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e0a14c04cd9ddb89e4dcfda351fa2959/61873519658.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c49428c4---fepigu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4bbd44cb0e51c0928d381c3809558a50/vizabipek.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/32730887017.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/2b537d45fad3f986dfe8ccb5669b255e/tikuxizalupopisolog.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210512210309002.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d0e519bc---68308200534.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2e81e1178ab851aac38e586156dc1b24/19186133556.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dca98b7f0---54720746871.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/dr7iugdggu7ml3ib0icsvpr810/ruxuvatawafaweparutati.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ba0913dd---jatoxolidiwe.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/jaramaregabetonemolor.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c45f20a1---sutidufuroponoxugaximer.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/44954381077.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5564 bytes
SHA-256: 4fe4d6b61035c1b92513a176730cadcef3289c850672ccd9c48e79bca17a3cd9
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 11500 bytes
SHA-256: 4c17e4c47f688834e08d0e46c0adcadddd5417b82cc9cd4ebbcdb7d035e7f026

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