Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0c259646276fba…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 16:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d04e63d1a0dad4aa1335c59743470857 SHA-1: ce69bf628123526cf83ac3a7132f55b8042d15a3 SHA-256: ca0c259646276fbaedbf027b730721461a1bdae5fff68fc27db3b7680fff238e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed to overwhelm the user with links, potentially leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=1.8+kg+in+lbs+and+oz
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/64931cf4817cf4af94388aa764cbdda5/logalopezararivibema.pdf
    • http://ackerviewguesthouse.com/userfiles/file/jutibegegusegomederomorif.pdf
    • http://fzcce.com/aimgs/uload/files/geporobovotoduvid.pdf
    • http://przedszkolenisko.pl/userfiles/file/xadiwajifewi.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607289a467a51---15772105910.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b5236fd6---libuwakebugarake.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/16efc9699130d4929fc961fbde5e1fb4/6649271440.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/61905fcd5c5520a1f80738ae2ab77b63/14846613593.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363bf1ab85---wugarunupisu.pdf
    • http://asckhn.com/acskhn/userfiles/file/vozokowanepexeretej.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/fekugibutamokuxiwozaw.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3a589d60ee27ea870d09e687e2c55b62/vumevugevoxusolovepuwe.pdf
    • https://transmar.biz/ckfinder/userfiles/files/45127733084.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/227a06a0c76e57b728e6425aa254b343/nujukamazepalinovufitila.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d3b2c550d---gidoxubunov.pdf
    • http://anhbanglaw.com/userfiles/file/42230324120.pdf
    • http://eperon-kochersberg.com/img_db/jolivabowogapojerikire.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81c8cc288---selen.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_off0000c90e.bin
0fee82d81577dbf3f5c26bfa4c22179d3d180219ad1dc4ffb3b59262d501493c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 10616 bytes
font_01_sfnt_off0000e13d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 16792 bytes
font_02_sfnt_off0000f94e.bin
f7b9253987216832ec511a3c7ffdd777d8ae21bfd21e5a9c2e014f7e310ea55e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 16192 bytes
font_03_sfnt_off00010f00.bin
5f68a577abc99b1f7f1b6dc4cd912ffa4a655846d0b60cbc9409067b8679fa4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 17716 bytes