Malicious PDF — malware analysis report

Static analysis result for SHA-256 9193847a8f6aa7dc…

MALICIOUS

PDF

91.7 KB Created: 2021-07-05 02:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 935fa2098eeb671008dc0e952b88f708 SHA-1: cabc4c119e6ac884996b7736ef279b57684b7b99 SHA-256: 9193847a8f6aa7dc7c2ddff77e29b05f7c9e6e8c6c196fab524ca35bee79f024
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and a callback lure, prompting users to contact a phone number for fraudulent purposes. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised CMS upload directories suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607003223110d---30027237227.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7368e42a7ac3d223c8843296f270ac40/vawewilokoxi.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/lj430uhmecku11k97l2ggj4q0u/1837333077.pdf
    • https://balaji-technology.com/userfiles/file/77636466326.pdf
    • https://stvorki.ru/files/file/45177923196.pdf
    • http://liavanhaeringen.nl/userfiles/files/mirovipapidesasakek.pdf
    • http://aep-tc.com/cache/fck_files/file/xomigovatugil.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2f08439c143daa0154276598235cd264/vezosawawodirazixezopa.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a48fe23b85e---27392169122.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1224f7jr5d2hr0oo6pkd8eeb76/gazegisepuvuxasodadiw.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da78817392---112947491.pdf
    • https://tangente-mag.com/img/file/86060893409.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa4498d18---7128131403.pdf
    • https://butagallery.com/userfiles/files/86242423982.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8811faae09bcb57573956339ee84a2ac/vowuwoketinegowid.pdf
    • http://dental-forum.ru/userfiles/file/misor.pdf
    • http://inlovehuahin.com/file_media/file_image/file/betetijevowo.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/efj1h2pe2f60evffhjvgh4nc05/panugero.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/sotofazuvitujutuju.pdf
    • http://effektfilm.de/files/file/dakelavodadenonikujeku.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/47ea31bb89e2bfebd08383445010f853/15296287084.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b0ec6efc3c9284ff7e6a81e531453e4b/95526099763.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f730594aec---fuxuxisojoginiv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1b7ec6372---50684899990.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=trenching+and+shoring
    • 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_off000106af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16792 bytes
font_01_sfnt_off00011ec1.bin
4b977b2839e60e73a4fa1cf87d3ca2a5391490c14078480f5c5ae5879a145d22
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16688 bytes
font_02_sfnt_off00014a44.bin
124fc2ae2d4fcb588d96e1253a608fc0c1e68cd2f809ce31b2b6afe4ecd47caf
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A44 10468 bytes