Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39537dc6fe89053…

MALICIOUS

PDF

82.9 KB Created: 2021-08-15 08:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 495a42464db5242d3db4b2fbcc7d50d3 SHA-1: 272daf16914d721be478d20abe6c768e59ace698 SHA-256: d39537dc6fe89053e15a091ad46a62c526d2a6d47274e1bb841d6241d315b8dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://archism.ru/uplcv?utm_term=formato+cronograma+de+actividades+xls PDF link annotation
    • http://ansing.nl/userfiles/file/13756207880.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/57793161455.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeab8ace80---widejetasugojarov.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100673a5bae---dovarisufavomukuxodulij.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/radozovujivelom.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e999dd47defd0f92bff1150be1dd6a5c/81516313492.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/49773245593.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c2p1tol8sdo61b1ns8s3lnurh/nukajowovuwagi.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/49134283764.pdfIn PDF document text
    • http://aimic.com/userfiles/file/61167686078.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/34016163e4a62844a21bd895c67bd3de/morij.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b11570ba0b8---ziwiwodiwodoziwilixino.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acaf916acc---sazejubelisobabo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d222bb28a12ac48976a29df80034e6ae/lejoxa.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/73165981113.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/975275132ca17e06de3aa9d3f7eee909/pedoliziwopikaxogibefo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a88260bad98---nezifogewoxutakiza.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/fawogaxexawabumego.pdfIn PDF document text
    • http://greenld.com/userfiles/liguxewezatowaberekape.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/10743079973.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/nefusazakibarejuzeveki.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c18fdd106---virerexejodotitagefub.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_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 10860 bytes
SHA-256: 9488152aee8d9ffcb354f7c1eed4190bfe3171fd3928d29c9b9b205f7bf7f445
font_01_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 17412 bytes
SHA-256: 949a60ed0bf5ab1d5a25a866ce0f6bd4f01f4a9821f3504db0c7d4a5499c537f

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