Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a330a9fbded68e8…

MALICIOUS

PDF

82.4 KB Created: 2021-06-26 18:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 352fb422bed896e825b8c3e4649a2912 SHA-1: 83fcdb24d3ae3d82e24caebbd3927edd95a3b3b1 SHA-256: 9a330a9fbded68e813e071f767397a3396fc85bdf51eb333d95618e232297b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs that likely lead to malicious content or phishing sites. The presence of compromised CMS upload links and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=carrot+calorie+count PDF link annotation
    • https://catwalkdogcome.com/editor_upload_image/file/ponegodiz.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/88745109368.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/gc8c39687kr9rk7rjr18mmmisb/rusufu.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/11013121225.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a74e4d7be5deddb88e61c4fb77a7f9e2/tuvenipifog.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tixojewukoleder.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/putil.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c2d3d50b399f825247286128c247ea92/19124290893.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0839b2981f---bewes.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9q569cjslmcu05dtgi77ltg8n7/87066065666.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/49033114713.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8157b09187ccc857271ddee22655242e/rimazubar.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/21066143244.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9gk54p1guoaqlj08si1n558q42/56849277154.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/novilomadarofex.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/sd485m288g7urgu69u5uv313p7/kiduxitebegagutipob.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbe3c61b6---9033473651.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc3799e4ff---67749703126.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/gevuruxarevefuf.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ff83e3cf---tirasepedonefekixof.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/kelurano.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8163cbb0ca13add236c9e3606d91ebe5/xenutakesafafekiwudop.pdfIn PDF document text
    • http://polletnv.be/uploads/files/58749385790.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/wugoritis.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/65f394cb72c5434a0dafb4b1ee3d4dd7/sotakufi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4f8126aee6f11b6408a06f5fb6777ac5/32687396981.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 10184 bytes
SHA-256: a36ae2456f5fadff9299c76da18725ca3aceb59c8c2684d1b187a292ddcdf7ff
font_01_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 17100 bytes
SHA-256: cb08793f77d1b48758ce2a84f3a88f870a85f7c39d16bfa87a04897e38e47fe6
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1