Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96a01a08e244652…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 05:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50b154d3d5c5c1f64fc31152e31e1595 SHA-1: 5c5f33a597bdd89d655fd69a8e2295f28a158e45 SHA-256: c96a01a08e24465293e7ae06d6ab9d47695cb8cdb6c7d0f553ba35a7a5c89d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trompis-tondschungel.de/userfiles/file/24953049200.pdf In PDF document text
    • https://detmers-kontejner.hr/files/45270567994.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/13513137813.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/dufenorijuxolaf.pdfIn PDF document text
    • http://fedime.org/imagenes/wegegore.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/24843011255.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202199433291559.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/zarafimebomebi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613320b7d4dcf---povipevuporuxo.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/gebisosisi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332210e8056---tululutanivexikodi.pdfIn PDF document text
    • https://braus.uz/images/shared/file/85058007724.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/paxupojadiwifekopijegep.pdfIn PDF document text
    • https://jotelek.hu/files/file/sigazu.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/xekapedawufim.pdfIn PDF document text
    • http://babamoleskine.com/files/file/vaxeroloxinupe.pdfIn PDF document text
    • https://sealskinz.ru/files/file/76399273813.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f30eacb47e24dfb8536ecef81deb1d6a/9020574110.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/ranofunot.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161467d0d57952---rikozibe.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631014404_349f6d8e0b.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=god+of+war+3+apk+for+androidPDF 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_off0000be13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE13 10436 bytes
SHA-256: 44642d11e04576c789a558143ee8c1a40c2e24f35f36a4197b395253c3514577
font_01_sfnt_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 16996 bytes
SHA-256: 9916276a919580f14c8d150d7861cb52d704b8a45f6c3ea27340af54bcab5568
font_02_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1