Malicious PDF — malware analysis report

Static analysis result for SHA-256 55229955db5e22f1…

MALICIOUS

PDF

84.3 KB Created: 2021-07-16 15:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad306bc12f88cd175c6f89c807303991 SHA-1: 0f7abd5e6080510350a098a006c10f8da431a598 SHA-256: 55229955db5e22f12fb4ccf789eb79757c1c61d933df5b6b4e861734312860a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://familienbilstrup.dk/ckfinder/userfiles/files/76488273782.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff7c31e4b6---61027189151.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac7b918247---lewepepudegoneminepuvutu.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210613041155173353.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/87847883893.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/89768725000.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/93c0487a8a0c74f4bd3a7014e307a7eb/jibabubugotu.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/69110571491.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/17016728691.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/47e0f20860ab817c01e2b9f0fce8ab9e/45080440122.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f31920088fba22d2ddcc99865ac7d569/9640395225.pdfIn PDF document text
    • http://heizler.hu/files/file/44970706282.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/73668942530.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/muxinaxenozizimazemil.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65aad5cd7---52169154237.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/84165441819.pdfIn PDF document text
    • http://gptools.net/userfiles/file/33676427255.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/19012f92bb8f5fec9472413bea262f55/96972003279.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c65d90264---fovefuxisinirimidixenape.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071e117968a3---xamajemividonava.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081e05d14c27---92265038470.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c487384da6---ziporo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=never+give+up+steamPDF 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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 10468 bytes
SHA-256: 5f70d8d3fcbc19cd194a064d3fec4cfc584fe20b14df77d54f0cc9b6637baafb
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 16580 bytes
SHA-256: 8422e506d7720aedd2d54e992628a289f8c0f519ac06871ae7a8992fcc59b508
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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