Malicious PDF — malware analysis report

Static analysis result for SHA-256 93664b9bbfd05870…

MALICIOUS

PDF

83.7 KB Created: 2021-06-27 09:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5b984d34832b056df658aa0a76b9504 SHA-1: 0aa046b07cce9d7bf93ebb59b60df7e2b1fd903f SHA-256: 93664b9bbfd05870d805ff9c4c846b0ae876153e95e3dea393e6a294fc93af1b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b395f2cb---29770533560.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc24662f1e---59194334439.pdf
    • http://sarljarry.fr/userfiles/file/27439052945.pdf
    • http://kme-kme.cz/files/file/morevetako.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1581e57644a5218f5b1b3381d78f7c85/78115765951.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6ee9b07cfb310cbd4c528b25b6420ed4/jojufufakemowezuwejokulo.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/loteros.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c316a3c8ea4---sigojekupege.pdf
    • http://annandale1963.com/clients/69704/File/kozukufed.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/minakol.pdf
    • http://absolutelyneon.com/userfiles/file/4332052080.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rrdnlfhg75f7jc08sak4bl697s/79178207771.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607522ec146df---82674162466.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/sufin.pdf
    • https://candbco.com/ckfinder/userfiles/files/safapo.pdf
    • http://pogservice.ru/userfiles/file/porewofagizisedaf.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/05dcfd22861c59fce47af13ced601201/6695394504.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f9776a2c---38049234195.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba59e2818---25198829425.pdf
    • http://gwhs79.com/clients/867100/File/virowonikixim.pdf
    • https://people11people.gr/uploads/File/rugidikunisatesetujugomi.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a678576ac7c---zosasadujifu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=clinical+and+medical+negligence
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin
eb78398ad2b2e779b5dfae2ca938d2dacc801744d0104e944f14ef59ec9555cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 16304 bytes
font_01_sfnt_off000112c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 16792 bytes
font_02_sfnt_off00012ade.bin
05bd2abf67e0d2f45d714faee35d3ccae7725afb255d4c89ed5479b008028daa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADE 10260 bytes