Malicious PDF — malware analysis report

Static analysis result for SHA-256 c598d895aa2a7952…

MALICIOUS

PDF

89.7 KB Created: 2021-07-03 03:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d2436eac55600fb7e6c576a571ece7d SHA-1: 45fbdf5ea5d0bc8233b5d58924b31ebbfea0c57f SHA-256: c598d895aa2a79522e60580db345d8324a0edc4c347577c79780f7f35e9f8d67
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://1975geegees.com/clients/78603/File/zofowafimoxegogabine.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/882ebb52d4233616e98f013b42eb63e4/83246813718.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/fq6mtjfgsoioov0kt0ssga8hqg/fadutelowujukixali.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18b1b5dd1---delikosumelol.pdf
    • https://guapa2.com/admin/fck/file/55079726913.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/zaxusikusedowobojituziji.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1f6147fc---13052830552.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b48866fd2c0b7f7a1ff72df900783687/66124526590.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/133de6f3e098140566fc2874a58d5344/53451234022.pdf
    • http://westernstudioservice.com/admin/userfiles/file/75625717012.pdf
    • http://rainbowcaterers.in/userfiles/file/39973216172.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a458b893575---sefixo.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/211dd02e07b79871cac8a901de3e1c65/87025221219.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/79657486431.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6f4e3251---5215170017.pdf
    • https://betalinktech.com/blmedia/file/zudenapovugewuxakifega.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/79634246335.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/032adca38befc90b50fef2280c822210/wupajilivolanudupevi.pdf
    • http://yachtandgulet.com/userfiles/file/22225961236.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3028006950---wikusibok.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/kumafukutiba.pdf
    • http://garmagostaran.com/Upload/file/1022707962.pdf
    • https://activepymes.com/pub/file/polewikenajuzopulirobirid.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3049bfd91d4f832fff442c1174e3b784/30423784258.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+family+man+exhibition
    • 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_off0000fa53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 16792 bytes
font_01_sfnt_off0001126a.bin
51db3ea5417a15ea3b5eec2005d31fb4f081941a6ab556ead302bc1265c87cda
pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 10532 bytes
font_02_sfnt_off00012a38.bin
55d56f05f87337a65c52a842326418599ef55474314e5fa9a32f0abb3ded007a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 18100 bytes