Malicious PDF — malware analysis report

Static analysis result for SHA-256 40150224f8cc2661…

MALICIOUS

PDF

83.7 KB Created: 2021-06-21 11:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: be33c657e577e1af83f6f3b701922daa SHA-1: bc41bbcbbf37c68f3e6d9de4bb6346310f38c721 SHA-256: 40150224f8cc2661de1ebd3ce29b288f584351b74b3e893707612f4646b44de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. The document body, though heavily obfuscated, contains text related to 'beautiful ppt background designs', which serves as a deceptive pretext to drive traffic to these malicious URLs.

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://coretry.ru/uplcv?utm_term=beautiful+ppt+background+designs PDF link annotation
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/158c9d8e6112b97858e74c5dbbb5bca6/31238113143.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/u3bkp4dnhcftfs0r9kb9h7fk31/dovokuz.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dm0js25lckufhq5eq2l91r5f8b/fawigubewixegegitekopifi.pdfIn PDF document text
    • http://wenxuezj.com/images/File/vozivaduvodame.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b656ca5f941---87937391542.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/zadimasa.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/02qsjqg5jrtdjcrc6t1c965h02/56055250889.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d75a43325b---lujowimerovo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ef815dcc---21591766778.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b1b2b592619fc232e60530d192cec36/popitapiwed.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/ribus.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0361e7e6a---jolitafe.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/28847005450.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ca9e60adf---morusotijosuzu.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/74211949401.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e4e58b701---xetejulezodat.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/40025595787.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_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 5576 bytes
SHA-256: bd0493bcedcf2fa224720bf0326b90634d3b8b1c775024986e2b4de319bca811
font_01_sfnt_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 11012 bytes
SHA-256: 757e36c438d7e6952429a74544715692cd7d9638dfe688a6909d09c0f5c5387a