Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da232563f832635…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 01:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad880060fd7e125c33e41433534fe957 SHA-1: b54b273f603aeef4eefd49c6da1d2bd7986ebaa3 SHA-256: 2da232563f832635d2005752c88979e778d2149a2c10fa21176dcc1309f3a460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://arerp.kr/data/file///nixoxudomevekafof.pdf In PDF document text
    • https://istruttorecinofilo.it/userfiles/file/bidugelijulilogep.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/53565372330.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2e6523ad22ca8eea3087242cfb8b6878/fibusipepimo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714a8088b3b---17547731388.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/makujenasalowiwus.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609319bdcfb63---19154994896.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/81732332694.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/97341406133.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/95638524482.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/46913354458.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/81524701707.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/33131759823.pdfIn PDF document text
    • https://nadamasristorante.it/file/35546934396.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zekademozuritolesira.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/21791790670.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/wadogeliluware.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507044720224308.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ff1802a3---rudipodevulubeb.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6df78b95a4---24272332810.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/63653933558.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/26541076595.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/xilemakoke.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/revevitat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=objectives+of+inflation+accounting+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA6 11156 bytes
SHA-256: d2329e3ead6f2ccd732221c01efa98e35e65a88ddef5040299fe3eacf64795c6
font_01_sfnt_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 14584 bytes
SHA-256: 694b90c00fa55995e9aefed71a9af1ff33c66a2ccf3fda3647072e6a6082de24
font_02_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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