Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a0afc74cf620aa…

MALICIOUS

PDF

91.7 KB Created: 2021-08-13 02:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1aa3980838dd02337ef7c8330615aa6c SHA-1: 6163d91bdd2b0562e84a62ce652639666e64b207 SHA-256: a9a0afc74cf620aa346b31adba9bf725f01b8cd0f65714ed0a9ae2406f46bc16
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/77ce22998f695f94aca4ecc7a9852fad/30033032731.pdf In PDF document text
    • http://candemdientu.com/Images_upload/files/42806612560.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/76833335031.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607034c0e0cca---nuzenefujigukituperi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbce3bf73e---92091727648.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/81856005521.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/dapofuvobudalosafiz.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/61331844044.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/wamopiruweruj.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933f042d539---kanitisebamugazo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c04567936f916008f76c88d973b5c03b/61830172739.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/93242130931.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/a996htt6hgrdub36ai58fniibd/xoxudavenemukodogakan.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/foximakubi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b4e4e5b032516e1a9f2a72e9149f0d9/pasiw.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/79253386274.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/p198dpp1alfge0c5ebhrh1loj3/24776345027.pdfIn PDF document text
    • http://maxbrio.kr/files/files/dibamufiregakat.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/fibexawikigoboferijifan.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/36vi503l2n6nbmartm4cc603l3/warozopo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609269d44c116---44513305810.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/fiwipezodujamul.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b874dda96425f1b51e2cd95d52248a3b/jubupidisoxusutemexe.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d0242aacc7b---juxiwokode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=important+synonyms+and+antonyms+for+nda+exam+pdf+downloadPDF 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_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 17284 bytes
SHA-256: eab4bf21f4e924a4361e4ebb0822a29b3c83b0530c5fa257089079b23abdc86b
font_01_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14683 10820 bytes
SHA-256: 2135836dd16dfa7cc7bf6d88d04542e334e7339a437c59fdd79b253084482c48