Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e213f3f526b9cd5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 02:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f003c7c7af72b3e81f4dad9535110f0 SHA-1: fc784c4ec8dc1df27ac5f4e8eb8c40c61654d5fd SHA-256: 7e213f3f526b9cd5c5c131f5c8378722cc6de9a4bcac5d0e7d70924c017389c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the final destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3b1bf9137962a17ab0fc67a5a5e5bf90/24621608084.pdf In PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/nabipuzawosex.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/278eb0a97ea5d77d7739538be844947b/bewigozuzodapakififija.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f796cf1fd7355a20aee641175f39556a/xijigabovaxu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ab53759da96fb28dcb4ad4bee3a588b5/62912752256.pdfIn PDF document text
    • http://amandamaitland.com/images/file/20566651290.pdfIn PDF document text
    • http://vtaky.sk/media/file/xajovowojuwefaxirufo.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/37506379720.pdfIn PDF document text
    • http://www.heksan.com.pl/file/luzuvuviwelivodikedi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4500ffe57ef57429e2d9c296a8c1b3a3/5972021046.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/h76cgta863pd75ccfkr89t49mg/kivikavokexu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/628b8351ca445f3733ad6860c7d4c957/22500516132.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/kotaf.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7f5239ac1---47091935655.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1201644283b4bc769144542e4552e404/11408295700.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108091927579966.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca4607a71---vabaxuvegitetanorewu.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/sovavakenujapelozes.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3f1e42ed5ee36fedb505d045a0993146/87528157314.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16108c21cd2023---40980333759.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/werul.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d3cad3a01f79cd882deebd090efb31ab/2414328487.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5a44ca05f2ed4f47f4ebcb9eab98cb94/51458386158.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/5359053936.pdfIn PDF document text
    • http://calisnt.com/uploads/files/fuvixapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=glomerulonefritis+mesangial+proliferative+pdfPDF link annotation
    • 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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 11044 bytes
SHA-256: 23fe60a10f7a391dcae5ff1acf23633c1831de0699bd25090eea6be3439dcc42
font_02_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 17448 bytes
SHA-256: a0272521e8cd873275a6312a9cd005090f166112a4dfcd2d18a49f6c6552e1f3