Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46a659f52893167…

MALICIOUS

PDF

75.0 KB Created: 2021-06-26 01:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f8bb3f15076dfb97339c486017dd0ce0 SHA-1: 2322514f7168ae7aa48bbd72da1434cb938b488f SHA-256: a46a659f52893167a6e2dbd76a56569a1778b3f25d50818f57d8b3b360d3e1a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d727770042b6d38cc7ec40b473620de6/41372751236.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec02a34341---kuvotezinakazixezuxuwame.pdfIn PDF document text
    • http://afslab.asia/upload/files/52859923376.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/bowuxegupufewu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a4347ec2c1161cbe5ed50a80b228565/lelaker.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9ef9c8ea2011cf0a765fa775d61d6a6b/62904622448.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0gfn2bslgdtubgruqt2jju8kd6/2858160887.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b13308d9fc4063a6fd379d5dc7b319bf/16783644232.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8e591045a42464a597850305f9b37acd/valojepunozizomukupipek.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607405b341f95---27568084873.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/nusewej.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mmri99dtmonnvutgnt9klqsh7l/buzuj.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/45880852645.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/13149670781.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h1215ctb2n81l0igkcsgqqfod2/sasokux.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd17b1a7efa---zakad.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/82f94daa8d6892b28a8ec8d0e0e9f057/tunudenexewedopobo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/defoladur.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/31184124829.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9fb683fa93e74f847e6c506485ea3912/mesobimeruvuvomifalotis.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc6964bfa---bipapagavubo.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/96529790092.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/3975944592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=perry+stone+books+pdf+free+downloadPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/71acf9b4dc10d50c7c78d8e22155d42d/jiridi.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_off0000c104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 17224 bytes
SHA-256: c63939da8cff1a178c8d3d0cb7e1eb5910269b7f06050d6bae29d8d7f5f73ec4
font_02_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 10832 bytes
SHA-256: aff434aa5be6828f96919f51968d0d7aa9ce4539c7d5eac0ebf4b3ecc1b88b62