Malicious PDF — malware analysis report

Static analysis result for SHA-256 2013455dca34c6e1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-10 20:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb87be2d194f0e11db1b6a939128afeb SHA-1: ab58fc3981cbeae3190faba713c5b300cdf43bec SHA-256: 2013455dca34c6e150c2254de31f403380f0a531dba618ff63be46143a482395
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/70213328485.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/9772489395.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/62652956615.pdf
    • https://value.ae/userfiles/file/makavitatugapone.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/terabetamafuwume.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baxilafefelewepixi.pdf
    • https://mjrspot.com/fckimages/file/38425243399.pdf
    • https://viadagio.be/userfiles/file/91339588638.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9c406f00---jiwebibi.pdf
    • http://ceresasrl.it/userfiles/files/nanuperizedobep.pdf
    • http://flapboxes.custompackageboxes.com/userfiles/files/labev.pdf
    • http://czerwoneiczarne.pl/files/file/14006576716.pdf
    • http://giovanniseneca.eu/userfiles/files/57728626592.pdf
    • http://namkhoabacninh.com/images/files/wipabowemugadawodonol.pdf
    • http://ipceurope.com/assets/file/70418115776.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/pukafut.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134c37e34336---mofago.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613294ae952fb---rojalejaxazed.pdf
    • http://myapartment.de/web/editor/files/72406018818.pdf
    • http://bhttourist.com/upload/fckimagesfile/sunosijeb.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08e30ba7e---7478757554.pdf
    • http://mxm-hosting.nl/img/editor/file/46944477027.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3fb683995a5ff176bca102db95561b02/3123308157.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/rutewemusabudulafog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lg+qwerty+phones+philippines
    • 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_off0000bddc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 16792 bytes
font_01_sfnt_off0000d5ee.bin
07ee5efa68dc62a7456f579c84bcd1697c47c6a7d95f74c29a61192ea5d11f79
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 17064 bytes
font_02_sfnt_off000101d7.bin
ccc6e0ca57eacdb9375de9de044c1b07550013e88999962f3bb8be1a08965117
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 10672 bytes