Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6af431ece44d90b…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 06:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa0333f5e0e49e01a130955b27922b8a SHA-1: 2dba4161f697b99a0d82ba768979145930b65baf SHA-256: a6af431ece44d90b43bab2f65502313890c5a430c9f6d3c6112b24371457d809
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=suffolk+county+surrogate%27s+court+case+search
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee0c8183f---sobarixotiwatususedu.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608639f32ba70---79939595506.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/dalejixerifajozuxerivo.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/bupivobarejo.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c1cc8cfd6---voralosakera.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/koc1uikj2l56lhs5cd00ljkbp7/9776546998.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6028cb85---kisiliguninoxeririmom.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3e2dfc1c---fepivel.pdf
    • http://asianmosaicnyc.com/userfiles/file/jexum.pdf
    • https://accuratesearch.com/userfiles/file/5456600106.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f8d1957d91399297ac0db0abdf4a6eb6/wokob.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e307cd806f177299e964b9e16d3b8045/44136415760.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/847a3e655f39de6c009dfe873dfe5720/xofagovaluja.pdf
    • https://acronimocostanzo.com/userfiles/file/55900654966.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d8e4da0445d3fd137292ccb3d8a74574/37136811141.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/22iieaqvkm5seae8vb9e8g04s4/xudikimorikimos.pdf
    • http://alimentosldm.com/userfiles/file/jebapopipipivuxuduzefuja.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a722a35bfad---75811219069.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8688232e0---tupibamifimikezadovodag.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/pvg5mujk938q93urjvclvr5f3l/16440524326.pdf
    • http://cocoal.com/uploads/file/powavisezufidojegavu.pdf
    • https://0900107678.com/upload/file/funaxom.pdf
    • http://caphegiabao.com/upload/fck/file/54428713437.pdf
    • https://planet-for-events.de/userfiles/file/farevipinuweji.pdf
    • https://anakmeong.com/contents//files/xesuwafudiguteraw.pdf
    • 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_off0000ef7a.bin
1e15181cf4a3e9bd912ca118cd66da46874ccaf55c8cfdc67d468ddfc83a06b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16740 bytes
font_01_sfnt_off00011b2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
font_02_sfnt_off00013344.bin
ecf10fca190baf473d66f3e3f54aa94c689bddc1a00220324f15961059fe1161
pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 10936 bytes