Malicious PDF — malware analysis report

Static analysis result for SHA-256 fceb2402524bcf27…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 15:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1d93daaa86d9ed3ed5191cc119b1d8e SHA-1: dc0dec2d879f5aaa4e79e01e200cb161df767aa1 SHA-256: fceb2402524bcf27120c600c344dd06ab0502f33c3d7ba1b029eca15b338859b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests it's intended to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://wsm.hk/images/files/61842120127.pdf In PDF document text
    • http://heryeryesil.com/resimlerfiles/wuwobixikosogajagafumob.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/befawujubilin.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/34514502006.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/57260900691.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/95936866709.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/wepuxug.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/tamaguxawuvisi.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50772594040.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/zenuredupojo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5e1de20f---nufisufelam.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/negenixowix.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0f3872ce---ganobaxojowu.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/90577370160.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/dagin.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/woratafawazuw.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/supomatex.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c4dca377d75508e053b194f1447b8e02/xarano.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/puzudipezukexulok.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/4490094757.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/fozazeviradebuzujuririf.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/34254598476.pdfIn PDF document text
    • https://afayl.com/userfiles/file/ridozuvulafelujapidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=avatar+tamil+dubbed+movie+4k+downloadPDF 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_off0000ad3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3F 15488 bytes
SHA-256: 7607cee30668870c758d8074e392b4700dd0c72a7a459049c773aebd4af75d20
font_01_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 10784 bytes
SHA-256: 1ad20e08be289c156f9aeedb29919d753e25f9a3301a663586e1640225dbce40