Malicious PDF — malware analysis report

Static analysis result for SHA-256 881ceea2852924a1…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 05:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a76230ff2ecb864b80178edc9f22159 SHA-1: 0e4c642509721a2e1290f77d1dfcf4dece1e67bb SHA-256: 881ceea2852924a18faa5667f84bb190b773dbdfe59a1e19e986220f22c7ad99
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the structure and URL findings strongly suggest the document's purpose is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://alexandrapanayotou.com/web/images/static/file/vipada.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3e7098u3dbg8sitqas2bl0fmc2/72422511888.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf59536154---86056413585.pdf
    • https://artasedanasingaraja.com/uploadfck/file/99993730864.pdf
    • http://aisef.org/uploads/userfiles/file/file/22811716893.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/suziponilamudam.pdf
    • http://classicalgardenornaments.com/uplds/file/84554693741.pdf
    • http://skogsformedling.se/bilder_umeny/File/rakugenuler.pdf
    • http://gleneaglehoa.org/images/file/32226167967.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9ab882c6---48042325447.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ce9c818f22f2f3fd0030f74cbf253d45/18200891266.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160783b37c7b4c---67812418369.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094321dbc511---88387247862.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608896294b2d3---78128847596.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b684a2f5e---16853150215.pdf
    • http://roland-toys.eu/userfiles/file/17244481757.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ab29bfa93b240c6a285a03a839cb48ff/namasasifeg.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6f430b2bd71043292e708bea26534395/tosinujusovuzepokemifil.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/befodif.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/63848061b9759f6cd790c293aded5d3d/27811913990.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16092de5d7e6d9---pefexenizusutajeweja.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a6kecng4suqmqdhbcjvmb9dp64/50595949457.pdf
    • https://ecoretras.com/file/jumiralanosawosuwo.pdf
    • http://bclgrouptt.com/userfiles/file/gudowofelowemituxesujusa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=i+could+feel+my+heart+beating
    • 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_off000102f1.bin
5c5326dbafb9aa72914e11a77ea0bb9676134b2abfe40ca8b0356939553c6cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 17956 bytes
font_01_sfnt_off0001311c.bin
489ce8970ebc3a9f5ffe50bceab53730d7028c9b08cc0c3a3e3f1050a2227c8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311C 11060 bytes
font_02_sfnt_off00014a77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A77 16792 bytes