Malicious PDF — malware analysis report

Static analysis result for SHA-256 8250b181856dd91d…

MALICIOUS

PDF

71.9 KB Created: 2021-06-09 09:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 46c98213752515442a4ef39579640d8c SHA-1: fad37af3166f1866fc6df55f6526abe01b46e3be SHA-256: 8250b181856dd91d6016cc567570e04a7d0ef083aa720c6730c587bc2e2b20ab
154 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8222

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=how+to+do+a+hard+shutdown+on+iphone+7 PDF link annotation
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/05evsa4ujpeo391l42t9l214c9/18079267974.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/738ef5f7fa31135e42310bbfc29a8acf/labubekavavojasesesaf.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41e3f0499---takobatuzirojawivaxopuv.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a79bf3d15---fuxigufumejosebeti.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c69ug517p5g3brng9l442qhtoo/59697062879.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/napasawipaba.pdfIn PDF document text
    • http://babamoleskine.com/files/file/60502858242.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/silunevorasa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d0fb133ff7652b63d9c91cdcfa543467/fefujejuwudagiwox.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb7625fd90---povitijavuza.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/88401774408.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5la1va3fp9f701hp5tg0u5h9j6/jelutorevefisonuginow.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a303bd49690---tipusakunu.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/siteforimeremum.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/tuzodisesutewefo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/79443364170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 5148 bytes
SHA-256: 810c907c59ed2d5bdde26e05b9e953142e4be4e8aca5bb5f099a8c40903db51e
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 10388 bytes
SHA-256: 9fdb797c7f81a588e99f33a2f0cbd1a66f3e8a55a897eef9c04aff1b2fa99a37

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