Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa3624facbf0f4b…

MALICIOUS

PDF

84.3 KB Created: 2021-07-17 13:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81ee8d512d53e094261e20ea319f45df SHA-1: 9f3ac5ef47d3e08ee2a277eec590261afba2f9b8 SHA-256: 5aa3624facbf0f4b277c39ac79748e5c02676dd2c55a560fd22ff81049f7fac5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l42otpenob1gqmhh9i5r684a34/23134464277.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c794be313683e9e8be1a6f0348f134c5/bazapodukigapemobirivi.pdf
    • http://yevres.fr/ckfinder/userfiles/files/21285165173.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/goler.pdf
    • https://eltonltd.ru/sites/default/files/uploads/vatekewitis.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a66b315c2---fazab.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2193991f7dfcdd57ab7430e1f7735b10/dovukuwoxediw.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7728ba532d22ca92b1c647b37a638336/98915385108.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/s8vmbdmj3lgs1i3qtck9hhp1ab/vereburededusofirodifuf.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd60d0ab1d---62605568008.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074951f93af4---21945899575.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b518c9cbd99---27153016197.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/9h0nq0lhbl4upjisqhs1hmv169/kijefetofudisuragavepozi.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b2a347dd4630750d0e2e2121e915329e/98909515489.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf81d4045---werobo.pdf
    • http://babamoleskine.com/files/file/kigalanerumetalakokokame.pdf
    • http://star-transform-moscow.ru/uimg/files/23325566277.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a57033af695---29441011213.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8da2be097---fusikobuvofiriwunoperi.pdf
    • http://perlawarmii.pl/userfiles/file/91760116697.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/780b6a199b95aa942701b6180cde6f1e/zoviparobofelujuliwufewo.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/84053b42075c607eb2340f19869387ab/70373162973.pdf
    • http://xnucleus.com/members//member_images/files/torine.pdf
    • http://castudio.eu/userfiles/files/fisifesofufumek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=list+of+adjectives+that+start+with+a
    • 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_off0000e8a2.bin
18b5e3c9d7b4cf12244fe497ab53ea64d028159959a9b3b4034e64ef8ec25d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10660 bytes
font_01_sfnt_off00010140.bin
862b32d2d4d130d5325b19875172bb2a55b050e330da7f148091d97d4fda7dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 16688 bytes
font_02_sfnt_off00012bca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 16792 bytes

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