Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f869669b1fdca92…

MALICIOUS

PDF

91.5 KB Created: 2021-06-30 02:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 227a465f67e3c90efa397eae8c582eae SHA-1: b62e27b6001c3f32a5d57617a3e8cf7b7d481ded SHA-256: 2f869669b1fdca9288328d711c695727ab0b212d92fde77cdd1b156244ec3abe
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and potentially disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple links on compromised upload storage and disposable hosting indicates an effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79268151f0---mufibasebusapifufitukure.pdf
    • https://accuratesearch.com/userfiles/file/39604255776.pdf
    • http://gerd-pollak.de/userfiles/file/mukefoluzuko.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/4984646404.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b4c0d24d---vuredizufutevidiwagib.pdf
    • http://ansonseatery.com/uploads/files/xotosoje.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd907e00a---jixazimaxudolovitilejekas.pdf
    • https://okud-istra.hr/userfiles/file/kivugovapekikowarom.pdf
    • https://hanedantoptan.com/upload/files/13748602945.pdf
    • https://alakharia.com/public_html/userfiles/file/demuninorevakaba.pdf
    • https://aimara-bg.com/userfiles/file/5818235735.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/sj91fe1ghdo2oju95quu01okfe/91947519331.pdf
    • http://maihome.hu/admin1/file/17523980429.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/mstn07466slcrarpro39hsgr98/48701656203.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fsghb9v8oghopbkd25c1hlitj1/rudonol.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/de7b8a190321205a4a27fb47f18f231e/gapogomivo.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/befonuzu.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc9ed60ab---18051525474.pdf
    • http://toyotaquangninh.org/data/dulieu/files/14332799516.pdf
    • https://tempegaring.com/contents//files/9602078449.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0r2htp2t47mlprkmctcm7bpboe/siluxabogadi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d2bc81e885a74157ec5db441bc41b7f4/fuwowumifazu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=describing+motion+verbally+with+speed+and+velocity+answer+key
    • 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_off0000ff95.bin
ca31e60982299bdec1821feb27c1e67bff4e6e9cf3f7f72b2dfb896a91bca6ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 11460 bytes
font_01_sfnt_off00011a2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 16792 bytes
font_02_sfnt_off0001323d.bin
63295889c122de64d0a8d6c9a27e969a5ea58e74c41beac9f11c9d54ab6e2f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1323D 17576 bytes