Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9b7596529a54c4…

MALICIOUS

PDF

97.4 KB Created: 2021-09-18 04:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5553dbef0435f6747fb6cd25715c3c9a SHA-1: 59b17951b3a512dc12032f52087dc1beb138ac7a SHA-256: 0f9b7596529a54c4e0b1a4cd2432ed921f802422f49ac70aa5e97e15803cc41f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://queure.ru/uplcv?utm_term=cancel+adtranquility+account PDF link annotation
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/retutimezaviwipoziwexi.pdfIn PDF document text
    • http://friulanapanini.com/images/file/64993741049.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401c867eda8---61222833201.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/1157937062.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/66016128507.pdfIn PDF document text
    • http://cpviettin.com/upload/files/xebivap.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613647dfe88f5---tolodufumalixurowe.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/65867500296.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d5d60159f4e429ddca07856f20a55f4d/tolufalitevoboxokamipaxa.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/foxitavero.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/2556534782.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/18315621722.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/dotigafibe.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/bemumosajas.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/doxifus.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/sinewixalulus.pdfIn PDF document text
    • http://cochemical.com/upload/files/97757561617.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143ecf94e105---xurimomijibakokedopu.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/28206550564.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/mizenemafeputanoxagib.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1972c6fc6---gesigatagefurokejez.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rolalinukuguvax.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/nusezisiniloli.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_off000117c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 10588 bytes
SHA-256: a7c9ef01505ad42eedaf8f3503e133beb6cd3261569a4c1b032513fe18c0df16
font_01_sfnt_off00012fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD7 18348 bytes
SHA-256: 42f0d7fdc089a592506b3625fe3c67c615196fe4de44adfdfa1932fa273ca53c
font_02_sfnt_off00015fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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