Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe9204300b1c54d…

MALICIOUS

PDF

93.0 KB Created: 2021-07-19 22:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 68f50246734f5cde86b4c783ed797e60 SHA-1: acdf809f99a2762d8120606ad89449de681ba448 SHA-256: cfe9204300b1c54d2cfbbcdcf160999afddcbb80cc07155f3779b4691e9761b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52c6d522cd---gutanilovujakef.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eff635a9a---37373766568.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/fokupogerukenobazuduje.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/333b6f4b56fcc852b57586e78e73b663/tozevowezape.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f567d70188a---92054928620.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/78fae82b00aeb522c38cbdc735fa80d5/nonikedanidexepobidavuvik.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c4a6aa2133330dbcaa15075c1dfee0a5/32002659579.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/35903829295.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sfp0sfpvhn15aabis8hk5ou1o0/luvapegexajugixamejir.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/ziwukek.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/venuzezadexumufofu.pdfIn PDF document text
    • https://mytopics.it/uploads/file/69652327880.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/84731331182.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/xasonolaxit.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3bfd630a---59020983301.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/t2ub6ccf905ieai22jh6uektf6/kaxukigovukekumavejow.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078868cd8feb---75179543804.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d87f123e---pupukukafuwugor.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/96799960725.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/38292830367.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/podoxokegasebanajo.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/12954468221.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1626688240.pdfIn PDF document text
    • http://soupworld.de/upload/file/bofit.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/mezofixek.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/5761227646.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/2835561569.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/pozusuduwafodar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=different+ages+in+historyPDF 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_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 10560 bytes
SHA-256: 9512362f892fc570457a92e2197d2b489b620e2d86ddb0d9a4df512b8d429440
font_01_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 19524 bytes
SHA-256: 90dab0776e359dd4442fb30fc09f6b3559e5bddb851287f29a419e9f5c51dcce
font_02_sfnt_off00014e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1