Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6fe1320d366b0f…

MALICIOUS

PDF

90.4 KB Created: 2021-07-02 10:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f902b3b3147b69cdf349b7def83008f0 SHA-1: 759e1d4747010195215d510fd72b9c991cb3e862 SHA-256: bf6fe1320d366b0f59c3bc3a10fbd9d773adbab4d999a261fd17e1d54f309076
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a callback phishing lure, instructing the user to call a phone number for a fabricated issue, which is a common tactic for tech-support scams. While no scripts were directly extracted, the ML classifier and heuristics indicate a malicious PDF, likely designed to exploit user trust through social engineering. The numerous embedded URLs pointing to compromised WordPress sites suggest an attempt to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ea58ece4c---74419029773.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dbbe91b69---33649114578.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d685d8cc9d---56991286237.pdf
    • https://abofahed.com/userfiles/file/bazax.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8afm4o43febpak8se4dna6lrc4/jufapo.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609177d839dec---90287209319.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727ab781ae2---xilodetujepu.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5843fec84c88be8a9812d111c921d88c/18901005981.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4bb1282dac95d3c798bfb30136728e18/6812169523.pdf
    • http://skolicka.eu/foto/images/file/vudikar.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf315bcda---21628713714.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e4a0cac9---fupigufufinatolebogale.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/22369535992.pdf
    • https://hirurgija.me//files/wonexomipodagokakowudirib.pdf
    • http://driscollandgibson.com/images/edit_images/file/47363759499.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/792ae5d90cf751450ef9dce5e73d6c00/sulegob.pdf
    • http://bright-mineral.com/uploadfile/file/2021062712332355.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/djfls5t8c7n36ahrudmv1mtpnb/46159820437.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef125ddecc---62524088860.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdecff0690---58263564697.pdf
    • http://ingmontagna.com/userfiles/files/32749341946.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f94ea659c---jitusupitawimababidulanaz.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aecbc1bc46---73234418745.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/56846506315.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58871373545.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c325002ac1be44e5fd8d9eee96f4038d/28596248031.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=common+bluegrass+chord+progressions
    • 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_off0000fc54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 16792 bytes
font_01_sfnt_off0001146b.bin
c839c8d21d94017237c85d38aadedb15cb7d03c0788c8c44831b089b2ab0815e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 11132 bytes
font_02_sfnt_off00012db6.bin
570908d66babacb1eb7f94559596939704944ce5657f278ed656b6ccfb98c3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 17576 bytes

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