Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fd3aace4706a4f…

MALICIOUS

PDF

84.9 KB Created: 2021-08-21 10:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50840ab56f4182e85cd8675bd30083cb SHA-1: c106c74a3b2904cc51db58f026ac1c617059e1e7 SHA-256: b8fd3aace4706a4f9351b983c3cf467ba084beb4274e9c15bb2bacffa2cc77d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=chatous+apk+hack+2018 PDF link annotation
    • http://ducthoaudio.com/upload/files/fumokopogogipudepud.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2493b7ffa---mezomisutuwuva.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/73ba382d46d5ebc28acc60981c36d309/44329128574.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c7af73140---12340029878.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161151467186a4---4834520475.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/zoruseduniluvogepatev.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210817130050.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/795f969bb76c515fefadce3514027a5a/lumif.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/jagokipowalimarulere.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/poxinubuwol.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b3o4uebpdjaccu9a2tj3jvk3ms/mufukexazubevufezasujubim.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/jjhuf7lqa7h2mj4t76bn8ks2dp/pofevunusegafiburosibus.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/zedaronetetibexor.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/83939693411.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608365e383daf---bukifatefe.pdfIn PDF document text
    • http://webursitet.org/Files/file/48179513115.pdfIn PDF document text
    • http://dzbnf.com/upload/file///fojezut.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fbocpa2kio9aoqhdr3esm67asv/56404352293.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607564d762765---megukanariloni.pdfIn PDF document text
    • http://yjccnc.com/upload/files/potolobemetava.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16116150a97b03---96572041171.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/rixugoxigifufagibuzuw.pdfIn PDF document text
    • https://basisnomor.com/contents//files/26154023924.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a00973e1804---50916447062.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD297 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 16936 bytes
SHA-256: 840a40cf45c6239308c8d019b24086d6d896b46149110cb6121fb5cdfe5aabe4
font_02_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 10724 bytes
SHA-256: b9d8cbfa1818f8dc573a3f477ba3f219f1218370250821d8bb98da8bbdd96829
font_03_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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