Malicious PDF — malware analysis report

Static analysis result for SHA-256 02aafea7276e4e9a…

MALICIOUS

PDF

89.5 KB Created: 2021-09-19 20:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee4d087ed0acd94071b78a11edae7426 SHA-1: 4f2041bcc3706242ba2ec2276349ee1ee24fe72e SHA-256: 02aafea7276e4e9a6c5f3ba522c1097fa385bbe5d086834c48112eeac6d30544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=compile+decompile+apk
    • http://hoangminhphatkorea.com/webroot/img/files/27204039813.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vjfe3eiusnjcknsqs5cg5ai49o/80745157240.pdf
    • http://langeline.com/ckeditor/upload/files/62385418178.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210912083445.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/wikukazakotebodor.pdf
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/89485186463.pdf
    • http://tradotel-riviera.com/file/vojomafopagilesefos.pdf
    • https://landtop.com/filespath/files/20210918120638.pdf
    • http://yuhao-tech.com/userfiles/file/zikupekimaxigitiwadali.pdf
    • http://maysoi.com/hinhanh_fckeditor/file/fojuledutajuferig.pdf
    • http://aan.kz/ckfinder/userfiles/files/78028329164.pdf
    • https://maria-galland.ru/files/file/sibibujulumimobateso.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/69872086251.pdf
    • https://resttour.com/images/userfiles/files/kixokogejak.pdf
    • http://myarrahnu.com/mo_images/files/winunuweguzomolap.pdf
    • http://studiofranzoni.eu/userfiles/files/76614788552.pdf
    • http://autosklo.sk/pictures/file/petoxozebugolunogubuvajub.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/popiwolebiwe.pdf
    • http://urotunisia.com/uploads/FCK_files/file/pepisedurosejubat.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161422a813d41f---xopuvasemuma.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7b34fa22---mipag.pdf
    • http://irfanmakina.com/depo/sayfaresim/file/54749844291.pdf
    • http://okvin.org/userfiles/file/fefabevetirasuraku.pdf
    • 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_off0000fb1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 16792 bytes
font_01_sfnt_off0001132e.bin
c311987f2bd90f55c0317fabbfba7e588b8ace9fd63f1da1c049c6bbb0105cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 17980 bytes
font_02_sfnt_off0001419f.bin
984989e5292c2b68ebc879b33eb662bccd889894b2e79e5bd9490a75a4ac6b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1419F 10328 bytes

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