Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4411d4e5e88e9e…

MALICIOUS

PDF

130.7 KB Created: 2021-07-05 07:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52e45fd1f512fa6162b10f8cc6e5c8a8 SHA-1: e66eba2565e09990023eb03cdfb4cf9803ca844a SHA-256: fd4411d4e5e88e9e72288727e0554f0b2e5e48d226d5ee61f688430a978f25e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to compromised websites, likely for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=noble+gas+notation+for+fluorine
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/oh5fmu6gdkm6nrlmule29fad31/27832400885.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877debc5c81---sikirugorojizaj.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b109f04ff0---vunijurafuz.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e4c303c3e953a5d12c9d0dbddb620abe/nuzapasojed.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0ae00500---ninitenumosunax.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/21428088527.pdf
    • http://157.230.241.115/image/upload/File/38120563262.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/u97ntbqslamtag5rfhjciml9u0/49572572199.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4d125027---suluvovunutotunevadaniwex.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba34a8036---wilunab.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160710e8094c94---15587198170.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1441a32c---59394922037.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/gu61qtrrhq72q4l7g0j5s8dbc0/zutifipefesoparavepuzim.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/34387740350.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f119603cb8---xifesimogupebakoxomuwuxe.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325ac8f6a5---kewuxabawevatijuzezenawos.pdf
    • http://aylincinarli.com/fckfiles/file/21279604579.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6915dd5237d5b4343695bb061469f9f6/mubujokozofedevaviteri.pdf
    • https://smilepaper.tw/archive/upload/files/31602948966.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g3kmcq8uof3juotgglgm7nfdn4/minonewunif.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608825bf83163---11843129665.pdf
    • https://xlspandoek.nl/userfiles/file/xilijibolikepobiforux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001781f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1781F 16792 bytes
font_01_sfnt_off00019036.bin
8c4155cb3afc4b858c24f71ca4b8ca70fdb88636dc23931e01a37da604001352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19036 10608 bytes
font_02_sfnt_off0001a898.bin
9ea9197b6a75c7fe67a727ea228f5add925cef9a7182c4c37535d81b948c8910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A898 16108 bytes
font_03_sfnt_off0001bdc9.bin
cc4c7f3074c3c706c53bd7c71ce7bc5cbf6de41f542ec1acc98a4cc69e3ed929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDC9 24352 bytes

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