Malicious PDF — malware analysis report

Static analysis result for SHA-256 844abc87f8151b20…

MALICIOUS

PDF

81.7 KB Created: 2021-08-02 14:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb3dd0a63c701222a2b4ea9db68b2410 SHA-1: b240972e6817852000131e56372f3c18db95d316 SHA-256: 844abc87f8151b20440217f5c7514826bba97f04289ff9f99cd1e3f2f5cecc5a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to external websites, including compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or 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 links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://projectmine.hu/ckfinder/userfiles/files/20643354161.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-30/20210530094909732163.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/28950052026.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ad6b55bfcb2c80f507d53aa6df95e61/57774091417.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/80040803706.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/vg9m0q0ugob5k1h24qg8vcthc3/51552966957.pdfIn PDF document text
    • http://megalightgroup.lv/uploads/files/61287980672.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928295c1efc---wefonegexome.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/93b2de9e5a28c16769509c023022b499/fijitopanokopaleloja.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/8555240352.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5f6c2437---93600531427.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb1aa8b6a---37101109082.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d11e50c8756f555c706652589f1801ee/xemuvoxafabob.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/watono.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/4ae05dbd079aa77c6ca897f87be949c4/84820565302.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/41214600480.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b64def19---14529543336.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fewijupalo.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/pudixe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c88d96c65---65514764894.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/81807530566.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/senerakutukuxidosifok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=shapes+and+relative+energies+of+spdf+orbitalsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54959683d---5975248087.pdfIn PDF document text
    • 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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 16544 bytes
SHA-256: e6bace0532fd1d6398fa134a666fb19a9df049646d6921a1c8cc3c29c33bc3a1
font_01_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 11056 bytes
SHA-256: 41d13976bc8d9503cded0a4d2ebb04ff6a23772463425d6a07af34aefa2b7cdd

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