Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26f8f5f7d383066…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 05:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9af71888451d8b1176bbdddaae688f52 SHA-1: 30f4db5610d5580f2c4078fb72ff8cffd58ae8a8 SHA-256: f26f8f5f7d383066d7472f31d9b05d7fc86640964206c9b9921bd4415485420d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure and URL patterns are consistent with efforts to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bsp-plovdiv.org/ckfinder/userfiles/files/87426104456.pdf In PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/wonetav.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f7a75026904091432abfcc1eb73e1c07/pedatexadafapuw.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/vutupenom.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/kekatalejexom.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/26838774287.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/fuponiduxejulodujun.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108180738253499.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9pq6781eq0fjtjrof29buvbio3/15256827777.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e82b3586843fdde198e6682cde7ea9c6/kowuruw.pdfIn PDF document text
    • https://krossi.ru/images/content/files/tijewanifa.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/5786888023.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/94827370802.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/6234332851.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/18868411028.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef97e58578---tuginoleru.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d41b58a0e3---vovilosavisino.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/91922924758.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e83bd4d1227---22786062336.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/34221343118.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/32474815870.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/j56hb98ek5p6nkl2t6em18rqk0/fufopenojuzinuzuzeb.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075da4df231d---vujesomepuredoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=red+beard+criterionPDF 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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 18012 bytes
SHA-256: a12338ebe602c92d611c15e47b60080a06d680c551dff659c8ea509cf1d83d85
font_02_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 10332 bytes
SHA-256: 3131ed7541b5ffce983d4cfe4f9bcf44cadbaf943056fe1dc1805b689d043306

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