Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4759c6775409c28…

MALICIOUS

PDF

75.2 KB Created: 2021-05-28 06:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd9dc62ea7493ef678fd0237d7c79f28 SHA-1: 160c40c073e325fd0fcc8a6569ba8c3f4e8691ca SHA-256: e4759c6775409c28244859b66ad40d7e3e3c58b70840dc3a4e56f2f04d6703d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2193f297d---natewunukipokemoja.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0bb6bae6---wosojijitovumoxogejugu.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9325b95f504234d864270ec30eb24e89/45259096562.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/wugelerezet.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5aa4d3b4---deluzorafed.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kbucaj91t33lrhukmv25a3hu27/gamososirareku.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1521e28eea6f79973af48dc33fd3df6/5497452280.pdf
    • https://tepihtrava.rs//files/53693789843.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160795e405c838---87894729883.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cmh3tgqm8fhneelfps008h3mdt/71864399074.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b8c56f42---339249838.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35d7f15f71bad45d3e3d258caf161875/figefonolujeweba.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5c0008c13aca7f3d15a4ccda919af042/tupibusamanojijefeguko.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/85j47prb3a5sjairup7s70amnq/nusifesumafenirekuv.pdf
    • http://schokobrunnen.com/idata/38245252163.pdf
    • https://247christianity.org/fckeditor/userfiles/file/rupelujogaduxazofo1620813156.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/pravrfs8n5n9bilp14pcvgb3rl/sarobariku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+the+clothes+to+get+into+gerudo+town
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc57.bin
b00abbc467abcd251ae053cb84247baa2bebdce7540e644935ddddb94f7231fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 4924 bytes
font_01_sfnt_off0000ed20.bin
acfb7a75dc7bc40bfc99214d361040063e32e2b20f7495f7bf2178e1d647b265
pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 10752 bytes
font_02_sfnt_off0001115c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 4324 bytes