Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0c7d44443dca66…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 00:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b2ca1f78836a967e99cb9713c960158 SHA-1: f17007e3b99eb9d358e4402cd58d2efce55af7a9 SHA-256: cd0c7d44443dca661429e80c7f02ec8df8b41d6df3784811043a1e3b6f7a9bb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2e074a9e8---xubebotatob.pdf
    • https://fptica.ru/images/file/53022969423.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/lativavuxan.pdf
    • https://hongming-eco.com/userfiles/file/43560125584.pdf
    • http://www.brickchamber.com/ckfinder/userfiles/files/pokagojejesasimava.pdf
    • https://jager-ig.tw/up_photo/file/gupabazesubobotugu.pdf
    • http://studiosaletta.it/userfiles/files/93750439810.pdf
    • http://zxpgw.com/userfiles/file/jalopijikowexemixajaw.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/83131266228.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210908171650.pdf
    • http://lagerunda.it/public/upload/file/wibakotajesaxuzeti.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4n4l2g5uboo5t87estdgl7ctgh/bojonabexumobuva.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/75011926821.pdf
    • http://jandenzobv.com/image_uploads/file/zexejuxubaxa.pdf
    • https://rafautama.com/uploads/file/90053458998.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/16871934046.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/roxibinosebekar.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc9c2ef89---95923209474.pdf
    • http://synowka.pl/galeria/file/jusemokazowipesovojetipo.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e763e8ff3e---livuzubumosafedifanejipal.pdf
    • http://mgtofubbq.com/uploads/files/59863149909.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/widasimizavasojuv.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144593c45a4f---9773112845.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/202721bb97eda09b8d24171e1bba885a/76802243668.pdf
    • http://phanmemerp.vn/attachment/files/46254215759.pdf
    • http://koala-al.com/d/files/65896101085.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+format+android+mobile
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2fd.bin
29bb36343741c265008066d7cfbcddbc6c64686862ccded69ffbba3b96331726
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FD 15828 bytes
font_01_sfnt_off0000db19.bin
3b906aa1939232c0c38c2d40829824ad37e37b502587a920d007912f90629c54
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 10564 bytes
font_02_sfnt_off0000f325.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 16792 bytes