Malicious PDF — malware analysis report

Static analysis result for SHA-256 13182152fd996b31…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 21:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ab5c74441b5f25e2160742b073bc28c SHA-1: 2587054b49407617b4c6d3ef3e82ebcdb0845a89 SHA-256: 13182152fd996b3181d1150df4cf89800baa159252fd84a8ecf56e3ffa07c5d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to serve malicious payloads or redirect users to phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://leuphuotcamap.com/uploads/image/files/kujodalik.pdf In PDF document text
    • http://belst.by/upload/file/fakejidevolafiwuvugesog.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/53732769109.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/68101499859.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78469670888.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6da388c6ad2dd89a38beb3e39c6c5d3b/19642716928.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/gujosunomu.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/91843745678.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/74940655946.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/7d0ee6bc9ed4d8089704a69ca221b50c/97944908904.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f03c4f7a---lobekifakadewuxepefedopu.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/zibobepozufuledep.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919680c54b8---bofewudedepiregupej.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/5705819433.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a927705f4c93fbcb1e1db8a2b55d1a27/26621610866.pdfIn PDF document text
    • http://unityproductions.com/upload/files/matisoj.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/wasuf.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/51180187323.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0df4bb1717c5f4dedd090447e5d98499/3761763623.pdfIn PDF document text
    • https://podimercrm.com/img/files/wesazafapekuvupike.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gepebapuzolod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=maths+aptitude+questions+and+answers+with+explanation+pdf+in+tamilPDF 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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 11188 bytes
SHA-256: f9b4e38582791a08db39d32ae37fd634a677a2eff29fd5bdf2975ea363430bfe
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 18936 bytes
SHA-256: f7b5eb1e64c2fb358ed8ad9175cc90e6c56b985588b278537d5b685247fef7c5

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