Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cb9999acd3f34c…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 01:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4f92cc43d9e9f6d0383779080db61f3 SHA-1: 9b90cd4f015404680251b4e1da6b7dc9a97f05e9 SHA-256: 92cb9999acd3f34cfd4543804f41de1c0b4f5b9883d8f2caa2134abc3c674f33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://philabc.ru/uplcv?utm_term=how+many+vertices+does+square+pyramid+have
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb26e831be---49015295225.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c67d50c8c70e3771fdab88295f834a64/kekupogiremim.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4df50289f---golalowinobijefov.pdf
    • http://sportsgarten.com/editorData/file/xipel.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4494adab---tivok.pdf
    • http://edwardnugent.com/userfiles/files/80838537673.pdf
    • http://kursadowicz.pl/Upload/file/kemavapovisow.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c532ccc4f71---73519030008.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7f6e6aed---nabeboz.pdf
    • http://decamiones.com/userfiles/file/78349697579.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6fb0c7a9f7160d1a8bfe9d15cc6f7198/83933864373.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f57bf06baad745c55bb83e5353203ff6/68762059001.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98b035c98---weverutur.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/je62imteo6q788ce3d02bur54o/tawisega.pdf
    • http://dokumsuzgec.com/userfiles/files/56130449267.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afcbca0522---korape.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bce9a8c47---xobopofa.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81b653bef---zovamideviwasujirinalu.pdf
    • https://autoprofi.ua/userfiles/file/tefudununogagalakopeperit.pdf
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/tojadatusajobutef.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/89785093579.pdf
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/15777266343.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160828add58a3e---18186597588.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0c6328f5---16268432402.pdf
    • http://ccsl.asia/files/25610023674.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_off0000e3b0.bin
45b5a47bff9a00a86dcdc10bdb2ce90f59a8a02898b8c3a4ce81fc6666861d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 11236 bytes
font_01_sfnt_off0000fda4.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 16252 bytes
font_02_sfnt_off00011384.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 16792 bytes
font_03_sfnt_off00012b96.bin
4b54ada17b4940b02dfd560d0b9eadfa49852cae1e6cd3e960fb100e0ffd9d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 19152 bytes

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