Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b911c75a5ea2c53…

MALICIOUS

PDF

65.1 KB Created: 2021-09-24 13:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c4de983d5c487a67334880ccf86990f SHA-1: 3de2f5dda11f3b403c1f2dbc249d057848808473 SHA-256: 4b911c75a5ea2c534a0b96542ce2e7669c07021ef284d33b35a47c20946355ea
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=pokemon+platinum+feebas+cheat
    • http://chongqinghaohong.com/upload/files/zobejoraxigokaki.pdf
    • http://akinmedical.com/uploads/file/jevufowabafasoroxapunona.pdf
    • https://carrieres-pierre.com/userfiles/file/42393945686.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/25638239597.pdf
    • https://luyenthitoeic.info/userfiles/file/sunaruvivisefanusilenus.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/959f740c0b3e7239aa53e485997bf06e/18276988293.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/xixinepi.pdf
    • http://hagithanh.hagigroup.work/data/media/files/65344750011.pdf
    • http://phfamilyrestaurant.com/uploads/files/risavevis.pdf
    • https://pernambucoimortal.com/imagens/files/47784480604.pdf
    • http://signfabapp.com/ckfinder/userfiles/files/bigenibiniduxedififavige.pdf
    • http://snieznik.pl/userfiles/file/96145082826.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a7870747---22166448833.pdf
    • http://uleshuzatshop.hu/files/file/fumaninexukum.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3rtaoth9vvd2vn69pteject2b3/99581746691.pdf
    • http://diadiemvui.com/upload/files/jijanozunol.pdf
    • https://destockbaby.com/ckfinder/userfiles/files/jarub.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bb727fdf---wixipugireluz.pdf
    • http://progettarecasa.com/userfiles/files/19915889993.pdf
    • http://fuku-zou.com/userfiles/file/86896927415.pdf
    • http://gojjang.com/uploads/files/18041140833.pdf
    • http://trongtinpc.com/luutru/files/runadasaxi.pdf
    • http://baggiez.net/userfiles/file/25221844657.pdf
    • https://taxforce.nl/userfiles/files/59773578916.pdf
    • http://olgapolyakova.com/files/files/zadugez.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BD 16792 bytes
font_01_sfnt_off0000cdcf.bin
ae94ee3e2b5cfe029576fbd2340e0776f529e4ddbd74760b7f57e687f864b17b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 16920 bytes