Malicious PDF — malware analysis report

Static analysis result for SHA-256 a683cb33badd7e94…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 11:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef17afb936d76c118e762422a7c31728 SHA-1: b1f6de42f28fe99f4f7cc94f6aa1a9b174bd170d SHA-256: a683cb33badd7e943c5653bfbc7e7df8a501072631983659378895349edcf601
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lead users to malicious content or phishing pages. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of link farms on potentially compromised infrastructure indicates a tactic to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gthll9f9ijv39ktulte0oqc3f2/1626637144.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0813e617f1---vijadeneka.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/48063878952.pdf
    • http://myhomeinparis.com/userfiles/files/rusirabub.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7413d8363d96c774e6e9afdff8d8d278/99119495391.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9a7140feda7d1573531f072db3280274/lokobemupabamumagokepa.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2ef8b1cf96c1290cf0c600659a86e7e1/27360402883.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/og16q7fi2627knsj3u2chl0bi4/duxogeteb.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b622c2879f5---57554476484.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32bea64611d22ae494b5da89203ce27d/91879559050.pdf
    • http://apexibd.com/uploads/fck_uploads/file/6669738195.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/5198e8ee3f006ab5dd7bfeff79686c27/kapugatasoxano.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dbcbf38d---degixeredazorogudokid.pdf
    • http://3qbuy.com/CKEdit/upload/files/13943054611.pdf
    • http://mywymc.com/userfiles/file/sejagadifizogafiriwupuka.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fe2840c14cb996f24405260081374ca/78697362979.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee31b0d2b---tusenavuzopawubok.pdf
    • http://cepsagibyachtfuels.com/images/photos/goxavir.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a194765de7e2a2b89fb47932cc30cb8c/zowuwidaxaxisesuje.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b71f14b5---timim.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b5c5506bd16ead541d1031e2cde85546/mirudasepufadozif.pdf
    • https://stopserv.ru/files/file/68616813580.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc7ea073b---divojel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+sculpting+app+for+android
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb8.bin
6ce987d409052517b703792fb9a8c098642e6fde870c8a8448263fd7ad799d28
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 16856 bytes
font_01_sfnt_off0001184b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 16792 bytes
font_02_sfnt_off00013062.bin
2e9371c91778b5855c385572e24efb438c4e9fccd42f3cada5db290697f09420
pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 10948 bytes