Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bf6822af21a174…

MALICIOUS

PDF

79.8 KB Created: 2021-10-06 04:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f302ed8a8a58e98981acf7cc2dc195ca SHA-1: 792bd0d40efbd2ff09ca6b835448e878009d0ec3 SHA-256: 89bf6822af21a174991dfd69b07ee8a4262a4d649c56b4cfc90c5bbc58b55cb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The primary attack pattern involves directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/kavinisamakasumawakojago.pdf In PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/81804109493.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/40321035744.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109191911424047.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/kiwogedagoluburarusinugil.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161483179d35b9---9499314801.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/46470773380.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/41617035418.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xebifogoj.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/guzapepawijomekag.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c595c62411---nefefadogolefuwesenog.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20211006_084905_184.pdfIn PDF document text
    • https://istanajp.net/contents/files/gafetejuviro.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145be47ab52c---80838763104.pdfIn PDF document text
    • http://spbi.cz/res/file/toterenijopep.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f81e6e4dd---84522003197.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d86f9db62---bekorafamid.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/75866367608.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3d0b6d090e824c5a60a34a8aa69af892/girularezapidotijodoref.pdfIn PDF document text
    • http://k1a.ru/images/files/file/joruzudadajufejefeke.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/87651441696.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/647ccd635c39454a942ee6707ef4cc76/76519388360.pdfIn PDF document text
    • http://grafittipng.com/userfiles/files/texibat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=muscle+fatigue+in+armsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 10652 bytes
SHA-256: 7667eaefbcdc6c7a488c53b516d3b156125ddc0ab9644c6305a9a8e410110b97
font_02_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 17632 bytes
SHA-256: bfbb853855b14326a9c92cf0dd36750667e7f7cdce02f884fd95d6e916ffe260

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