Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e70b89b5d51e92…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 18:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07982f113b5fb39a8f2800f803a33813 SHA-1: f5cb9fb9eb161880f260023a576922d30577e7c9 SHA-256: 11e70b89b5d51e923ec95c9a48c245222e7f7515aa2c1fe87a5a0b4882d937e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The 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 compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs and the nature of the link farm indicate an effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ldl66b03kldf7bk0uav5oemed4/kubowesopex.pdf
    • http://bigband-ulm.de/userfiles/files/xipunubugelotod.pdf
    • http://exteractif.fr/pictures/2/37244043737.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d5c4a5b3---14096285341.pdf
    • http://nordicwalkingturak.hu/_user/file/5318501167.pdf
    • http://ctkupavna.ru/upload/file/452741509.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/gonobebepebopatamape.pdf
    • http://cbafjvn.com/uploads/userfiles/file/jakejuvuget.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/o27nqtv99qeqlegovppb1ass0i/vomixibotewiwapex.pdf
    • https://andana.us/files/files/55579536682.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67163052144.pdf
    • https://woodfur.in/userfiles/file/bikilepagapi.pdf
    • https://readandenjoy.ae/userfiles/files/pezij.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/6ret9d6mu2f2kjmdhs9vad8ua5/xobuxabiladajorika.pdf
    • https://designclarf.it/file/babosadeforod.pdf
    • http://sun-green.de/ckfinder/userfiles/files/felibupumawaposukevo.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fa861b8a805fcf93962cfb1033a03dab/35289742414.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/31120b5b6efc61f763797db28a559449/66248570560.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/faf5a805c7667a69a64d201101a4cf9a/71756496587.pdf
    • https://shreenathtechnologies.com/userfiles/file/19449342797.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e05dbb08643156e0627a5b6dbb2b9fc0/jarebesu.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf77e78cb9---81028629994.pdf
    • http://gerastar.com/userfiles/file/18961963641.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sportswear+international+magazine+pdf
    • 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_off0000b849.bin
1a9b22d1f202a8f43f71fc57436e185b9ab0cc3cd3d5e1f86a18a29362221a5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB849 11060 bytes
font_01_sfnt_off0000d1da.bin
f544ef4e32150b49904d8481c5375cc2188b277f410c0f4854817b5c1272695f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 16508 bytes
font_02_sfnt_off0000fccf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 16792 bytes