Malicious PDF — malware analysis report

Static analysis result for SHA-256 152ad937e4a4428d…

MALICIOUS

PDF

103.3 KB Created: 2021-07-05 00:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1e7e37f3f372e8061811ce9b46568eb7 SHA-1: 25cb8c4169ec99df1fc7f3f9c6925e7c80f3566b SHA-256: 152ad937e4a4428d4ff60545403eb4bb0b2d3619061ae0b51d6209965c41803c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting it's used for phishing or malware distribution. The document body is heavily obfuscated, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to disguise malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a32ce42f0---53593602906.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7dac032af---vometufumaxejezamej.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30064db63---jugeboxuturute.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3kb14o8aphg2gk8eh0lbo3snvk/nelenodi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ebe81830---88661145957.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c25a64fff---rubibotikabofujefewopoxe.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/30958419949.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfef4479e49---69651309512.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/gcppfb7ckmtvgnp4l0vk01ngv1/lukenufemixabi.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ba152083---59051800683.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/werexoboxejulevuj.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/73300728175.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae723b669---majasek.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecafe03eb8---disaso.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55958795f---pemoniferegekapokusot.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/be617db93f092383fc5b51124e0c7320/80238609367.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2c31203477938568c1788cd7164a563/245135077.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e7f094db51ecc8d884a9ecc9cf5bad04/fomikobajadope.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/66170609207.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3s3qln82tqcvfdl35q9o622el6/16427717988.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/61d6484f2c3add8d80608237eed846b7/49257327779.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/50245847656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=larson+calculus+10th+edition+solution+manual+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012a85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A85 18380 bytes
SHA-256: 9f5459401fad43f7b99df99a0400d9414b40d252d4edd9741108d4a8c8cabea7
font_00_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 11116 bytes
SHA-256: db0348943f39058162f6bac0dd8174499dc200106ec61e30c81faa4fee1da3bc
font_02_sfnt_off00014737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F49 18232 bytes
SHA-256: 3242e0fbb375a38e1e1e91f78b9e941fb514fa91e19025b7bf301b1244afeb82

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