Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b7de8b9b1aedd4…

MALICIOUS

PDF

115.0 KB Created: 2021-07-02 13:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cf01e9c3075cc02c3c23758296ac6a4 SHA-1: ed8b4102ef5ea0a0907c48e3d7a63f0d57e05e67 SHA-256: 80b7de8b9b1aedd4bf2d3cce6ab7388cb110139cd37dafe2b4944207268bc5de
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://allg-gyn.ch/userfiles/file/zafijoditozel.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/153b4cb269a440dd140ac8cc102d7e85/toxinujituj.pdf
    • http://baggiez.net/userfiles/file/30752984355.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c390e34c4---kejoduwopefudenepekirogut.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/9pudb5tdtpc51hc4gkeohikqgr/tixidaj.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ssb5bpi5ttfp7f4c4nae95i95q/vuvotiguw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ad054f43---34922839548.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5547ba74bf7ff991a94e565b88ed182d/54442165379.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9c4f33d63da06f9186e487966e4d611a/49615637668.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/599c2778503cd3f6486e19e31e22b71e/woganuzijuvupoxaruzemagej.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6a6c0b72---jowololosejakojipirijatox.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5466e63680---10557175304.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8b1e313c18c4f058787474eeebcfee08/nopatodozaverotoj.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/wosufunigaz.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/fq39chva8r2s0ratqqv9vep70l/45693566647.pdf
    • http://18554080.com/userfiles/file/34970823324.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8d7487fd48a3994a91539b3f3e34f810/xadukatugodikaxabomevuv.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2178934f7a---45502056842.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec0eefee9---77207195820.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/abe5ee40f9a6e7672f7141616d4de57e/28337326735.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kkjvutodppg2441tq9gl9musg0/77752808798.pdf
    • https://atcotourismtravel.com/userfiles/file/tulurugumirigenudopivu.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/559db259a77a22bfafda6c3c1918850b/82222923550.pdf
    • http://eprdel.cz/userfiles/file/musirol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=si+unit+of+electric+field
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141ca.bin
096ce1dfe5a51fda8e23162434f5eb3ae6db5585a88321542b567671e861cf0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141CA 21576 bytes
font_01_sfnt_off0001799d.bin
14647761a3195b904c0adb38d02f6b8249fa3eaa7eb9f5cf0f720a018c0813ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1799D 10316 bytes
font_02_sfnt_off00019100.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19100 16792 bytes
font_03_sfnt_off0001a911.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A911 16084 bytes

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