Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a6f283f5c9443a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 23:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00af78a92d27d89d11c98723eca4892f SHA-1: 69f938a3361cb832eac2ab9816a31c0b348b3b49 SHA-256: 90a6f283f5c9443ab9e29269573b27c2b0cb9f1ffbb68280c9cd74b9c1ef55da
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://cructi.ru/uplcv?utm_term=team+meeting+minutes+template+pdf
    • https://lescourailleurs.com/upload/editor/file/zulefadevojulemomive.pdf
    • http://arcomproltd.com/userfiles/file/wamor.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124749216cb9---97028920769.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/62035741982.pdf
    • https://guclupin.com/calisma2/files/uploads/gopege.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/bd4sfmad6ilpd9qkgdh7ieqcdp/tovolekuzanuzinob.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094abaaa92c5---40842638430.pdf
    • http://hanarotalk.com/userfiles/file///81180665227.pdf
    • http://hzbaoyan.com/images/upload/File/4236752459.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160809098909f1---nabilunebajolegikuniko.pdf
    • https://0286869143.com/editor_images/files/58906783447.pdf
    • http://aklond.com/UploadFilesfile///2021050316220828.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082abc910789---robuj.pdf
    • https://dichvuketoansg.com/luutru/files/lewuwusojazumevat.pdf
    • http://ibshop.gr/uploads/_uploads/files/21502107199.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/pukunuvofewaveg.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9161def72379c579312c0cff6568cc5f/36442604565.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccabde4d9f---rudokopivosigula.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073628f7b237---17392257206.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gabobebago.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/bigovijawo.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_off0000d960.bin
875fc5b3ab05ed8c4cd95dfa732bdf6d1a1053a1557db0628a17398916635f56
pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 10684 bytes
font_01_sfnt_off0000f1a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16792 bytes
font_02_sfnt_off000109b2.bin
e44133f17afcc41660012518ad5129c21c6069047dcdee7ff7c412f51ae3ba95
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 17392 bytes