Malicious PDF — malware analysis report

Static analysis result for SHA-256 334f86dae980448a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-18 22:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf4fb3d4df6276b6fce02e5d76bca11a SHA-1: 6e2e4e7ee00295ac1d538aa595953f83de8c4fad SHA-256: 334f86dae980448a831ba4232d1bf152cc73464fa1d37d03569af2f5c0bf7715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://marta-galan.com/files/varios/file/kujimikudizuke.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2a5d4479---gifimakololitoxudetoveme.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd85c5da5---lisapu.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jalezasivololog.pdf
    • http://christopherdallo.com/file/fewunebijozesuderuloju.pdf
    • http://fittbike.hu/files/file/zamido.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af61ca0c81c---tekorebowodujisinax.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dc64d60c3---dewipevubaxupepavebatutu.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/jusoxonovipoxasede.pdf
    • http://casaalu.com/luutru/files/wipimeduwepipafawapoxodi.pdf
    • https://cowichanseniors.ca/userfiles/file/xobasomujajenekobojinita.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/u18es76ffc9nnp05vore7u6ndl/vudekowavikixefekapejapeg.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a4fb75c0e8c026f2eafb7b0f199c0492/15978725041.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbc9c3ac2---zasatijilufukiwudedewoxa.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090528044706---gadenejiwuvapelojalizixe.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081bdace2469---60611429261.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ed45c92d6b60d25fd610230727a87e6d/pufowuxurimejirorubo.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/47677190683.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/27091301192.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bdfce32c---22316810056.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/wimof.pdf
    • http://garderoba.sk/images/_file/kazagidod.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c6194c8679e22ce3bded58307d57e9dd/38609526945.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+summon+moon+lord+in+terraria
    • 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_off0000fb31.bin
662772d47ba0ebb3af034e366fed0961a2f2c2f0603a57d9cf3ca5f3bb734c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 16804 bytes
font_01_sfnt_off00012721.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
font_02_sfnt_off00013f38.bin
807723b186d30cdd27ea103087f004e28f6e5e9169be0f961df4423effa8e4bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F38 10588 bytes