Malicious PDF — malware analysis report

Static analysis result for SHA-256 62872dc1b4c0afcc…

MALICIOUS

PDF

70.7 KB Created: 2021-07-14 10:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 593946d4a57604809d1752459a5765cb SHA-1: dda8554a06709713b43f8befb7da60245f91260f SHA-256: 62872dc1b4c0afcc94042e0ae0b89d393d9595b2a2afd856c14076e268d5cf58
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised CMS uploads, pointing to numerous URLs. The PDF's structure and embedded links suggest it is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5836

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://ketchas.ru/uplcv?utm_term=darling+darling+stand+by+me PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/asr7sdh1ersi3ml4mt85tv7vs9/pujetelufa.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/betef.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/35960c5102f1727d8c011607d7a004ff/tefawulor.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa56cc64169---nuvexasoxegojonati.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be70e54dcb4---92091294853.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e7a582bc---88190937921.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210617_62018CFB20618F85.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/10946655223.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d758d4d3---99069856159.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/wulepirosuma.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bidepuwajovozufe.pdfIn PDF document text
    • https://alutat.com/data/file/84103069263.pdfIn PDF document text
    • http://charontrade.hu/data/file/86619713976.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3321ddbc16---jixabatuvupifogewuweji.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nar8pa79glu12heqa9uoldr7cn/zanuravofuvupegowa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bc54caaee---digidupubojidid.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9a5f79576e5ea4481ade5948c57bce05/pirorisipopujukenokus.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/ronununud.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c2591ac9a9317e379fd5ef24ef331cca/42832714383.pdfIn PDF document text
    • http://hkalc.com/userfiles/99087283224.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/95477811493.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/27065649586.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F9 17000 bytes
SHA-256: 1c45a510753677c0884da454c1a303667df075dbbc1e639a82b21679bfbe9d80
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1