Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5ebb37f7e160df…

MALICIOUS

PDF

108.8 KB Created: 2021-07-05 22:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 490e480a0122d0f66b755b686f6c9532 SHA-1: 0cdaac139aa8364236d04ee911269f22407fafac SHA-256: ea5ebb37f7e160df20e89ee1c783fc6f2e60d4f713790f8bb8c9d51463b76762
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • 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
  • 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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee5ea7110---xusupunisuwelikotevufow.pdf
    • http://tuclubcr.com/campannas/file/5777917880.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dba29b27---16561073642.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c947233b8---98422860674.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0dc50985a735aff0ccb0aea34f83c0a0/begidaxisiseruxubobezi.pdf
    • http://rheinmotel.com/userfiles/file/77940898645.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53b1b5159---5130016823.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c59861c775e---regisakabazeri.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843afd6ec6a---14736763736.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/zudabuxaku.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d791891e---lemitiwataronase.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/decf228ab6a5ea403cc861ef4f0a7b1d/rotedofedaratadopuf.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ji4jpl74ae89q2vp8uflcrl9up/bexujonawafofajux.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/987c9168c477fe9f9c075bdfae173879/vanadezodunufijatowaj.pdf
    • https://hssanesteban.cl/files/fajepajuxed.pdf
    • http://monkey-do.net/userfiles/file/musesojoma.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/sevef.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a523b4611cf---57880629719.pdf
    • http://musorcentrum.hu/files/article/file/mobevatudikakabufe.pdf
    • https://planet-for-events.de/userfiles/file/49054732100.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4db8574d0---92121816657.pdf
    • https://burstallconrad.com/editor_files/file/pomuvikabevaxemok.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/iv97bb78pkrdet8ijjqeo5llg5/15186174289.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b1b96dc5---tivetanogofubuvolup.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7508d06c---lomejaxoman.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=who+is+taylor+swift+dating+2020
    • 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_off0001403e.bin
e37cc2fec75bd09f2c76be1ebfb0fdffb843d3084650a88d1577f4e36025f551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1403E 10936 bytes
font_01_sfnt_off00015971.bin
564d587f2697ba6dcf35c1f07526631ba9caae70edad4de5fb7b57970d96d0f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15971 20184 bytes
font_02_sfnt_off00018d57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D57 16792 bytes

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