Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d62f5a5e423aef2…

MALICIOUS

PDF

84.7 KB Created: 2021-07-06 14:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59d62eefddf96fa9f50f8df47760784c SHA-1: 500548659c7b14ec2131098c3105574bead7c458 SHA-256: 8d62f5a5e423aef24915265dab45da577fb5c243fe05519f06e7bcc2710dced5
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous URLs hosted on potentially compromised sites strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e112ce96ba---14853703415.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f48b3869---jokorawurav.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc25416528---bupokuko.pdf
    • https://musikkursus.dk/userfiles/file/55888181838.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb802872e70---wefuderakedobalegalesi.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/040b4419e3f6c7288fdda252e1f0101a/66738957758.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8h5e9a8slbl4jbvsabhfu33u9t/xixuzagawosebatukaj.pdf
    • http://okwecare.com/usr/userfiles/files/mufumamoref.pdf
    • http://zonweringbelgie.com/ckfinder/userfiles/files/mamokosafosapinur.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/rosokowar.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160975cabd5531---68029501457.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/l4h0nhu4ai7laq5c9s33hbiph6/wudasazumemopijupozunuva.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/8228f9336a71f62ebc9fd47316e057ad/14035142860.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5378052658499223609d0a90bc4d92ce/zanerodularonu.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d8be152dbab35f74213ea38f4f5587ec/gugumijepimaro.pdf
    • https://marblobathware.com/app/webroot/img/files/sokotibimojusixo.pdf
    • http://edwardlankin.com/clients/86087/File/bojularozukuvif.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/99075811192.pdf
    • http://cementfeet.com/userfiles/file/15215949389.pdf
    • http://lahma.pl/_u/userfiles/file/57609249812.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0c4ebf5c---jakul.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/bigusez.pdf
    • https://arte-salon.ru/upload_picture/sonavora.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+ride+out+of+state+with+a+motorcycle+permit
    • 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_off0000e798.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 16792 bytes
font_01_sfnt_off0000ffaf.bin
d989405ec020416e9b8071a5b6562b908b59f9fc54b712928b6df7c6102c8f2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 11216 bytes
font_02_sfnt_off000119dd.bin
a10caca61382ab085842bf5d57ee0eaddc9e7cea3babe7ac5a416a432164e176
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 16772 bytes