Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e62be24c8a0a34…

MALICIOUS

PDF

92.4 KB Created: 2021-07-07 21:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d09fd8e5c0b4bac14468f3738def06b4 SHA-1: fe37570daf9da04e7ce82f1efe0746041354fc0f SHA-256: d5e62be24c8a0a34e5ea6975ea4a5231a583c55fa2d3fbbd73c2706d54768090
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites that appear to be compromised, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. 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 malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce643f767---75753929738.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1e62cda3---84596621755.pdf
    • http://matsonconstruction.net/userfiles/file/bopikojume.pdf
    • http://medicapoland.pl/uploaded/file/waluwolekutodo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3aef9f6b6---bewosigepafirabofim.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/44926428330.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c59b8382623---dewagibasigivif.pdf
    • http://lnimeina.it/userfiles/files/jelagapapadudasag.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889777436ef---fuderuzesaxiva.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acf190bb152---wuzisufujevi.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2de29488fa55a1c8fb669f50865ff536/43369014792.pdf
    • http://vidol.nl/userfiles/file/gepinuwigewel.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cpib5g80f2sgit8m1vim5v02lm/lozagixopijagadukewit.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/jrqjb0qmclu4q3dvblni219im7/55518135512.pdf
    • http://pijntherapie.be/uploads/files/kekajugezuz.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/kutakogo.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/42ce0ib44419jmtcph6nugqau8/mitel.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cml4trcou75aqt00kgce8fucpd/8875597511.pdf
    • http://i-dron.cz/data/file/dowoxilasokifi.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pfbeddder213ibapngmds5e8r6/gumisekimupuxelamav.pdf
    • http://www.anjhimayath.com/upload/file/kawuj.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/iu541npks07klsj2joe2fquj6c/74855874967.pdf
    • http://pomocnaukowa.net/Upload/file/25901204395.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=funny+why+did+the+chicken+cross+the+road+jokes
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2b3d83cac45a273f043443b4d08a634a/71120796515.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_off0001022a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 16792 bytes
font_01_sfnt_off00011a41.bin
c8ba671a95cdce5b4ed6accc758a520089f80ad4c26fc680c9c8f35b5ce64cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10920 bytes
font_02_sfnt_off00013388.bin
34d1fa9862f87e6f2cae5907f570c34eaf1b28f4186dad0f73efaedbfa5d4f10
pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 17872 bytes