Malicious PDF — malware analysis report

Static analysis result for SHA-256 54535fa6da0b0ca7…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 18:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9b9122a294946e9217fd1075b3bf7f4 SHA-1: 651ddff38ff664d11b024e832b6d30c549f0cc47 SHA-256: 54535fa6da0b0ca7eaf8a5a2bc00332624cb8d4d68e5d4d1ab5ebc2cd8eac06b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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 http://colorfusion.us/admin/images/file/65607592424.pdf In PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e125c957cb---fuludanatekinovutikivaj.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/faxowenowofubawozoxifur.pdfIn PDF document text
    • https://bczenekar.hu/files/file/medirulameniraxaxitexinun.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/maxebuxiwunosixixefukiw.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/putovozuxewevavalilalibu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5c143505ffdcf22148b8f9c916540613/detenujabipinewok.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/mazefis.pdfIn PDF document text
    • http://vodnik48.ru/content/file/74042010971.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbeb49c9d---29477775292.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/leketokozemiwogelutuzav.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7724a2b91674906dcf534540dcbf3055/78216466943.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/69117487759.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/72747511789.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/19580589468.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/10f414348c3d8022009ad3a01133ae3e/dupilafufimomagupalut.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///65531614521.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16128930f7e5bb---mosaxavazizanasizixojax.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891e1aa6100---gozifimadesutosepukages.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/dumid.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/21083463977.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/47235250418.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/kobezoxusawafosuvexad.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca2eea8e3---44184089299.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/nabujuvapewitef.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/74646959679.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/78241453376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+annalise+in+hebrewPDF 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_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 10616 bytes
SHA-256: d93aa35e9a2af9510bea05b1fbc4e3e98a25bd0e0833e060eaf1cf536bf954ac
font_01_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 19240 bytes
SHA-256: 6f003337960a4db11c54ba2ae3b183406ff63d706f8181f454c1875d06676c15