Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae659660b9f2f6f9…

MALICIOUS

PDF

122.8 KB Created: 2021-06-28 16:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0fd60526e7f404ef4a3f42e542c7cf0 SHA-1: 7b2d906ccc02747391efc1a18f67dd0043d3be75 SHA-256: ae659660b9f2f6f9dfb88925ea3cbbc5536c4884e786512c36143f4fb50c1568
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous embedded URLs that point to compromised websites. These sites, in turn, host other PDF files, suggesting a multi-stage distribution or phishing campaign. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely related to phishing or malware delivery.

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 https://crewmak.ru/uplcv?utm_term=unit+5+polynomial+functions+homework+1+monomials+and+polynomials PDF link annotation
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/nhs2toslsflh2e5mj96j9s7md5/7231242089.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/gevoverororedi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160719e7c6e440---fukakenamogisuvizajos.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b66b2fcba76---44494449299.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/93422017381.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/15688507607.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/8354637322.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/dakopevelekowowifavotola.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ceb516043---mometupelalezejefizobolu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ooojq5ci1sgr4roppe1a9ruh2r/93749283705.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6gmdpbkkg4oe1vmr5kfdib431u/27805620644.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/6221089255.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608125c66dfea---46838458669.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf6e151d43---luzux.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/042kjc4a22k6lcu8db3qq3ac21/96694528309.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/67908428007.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/o6ttvh911mibp5n0b85ldfq4lk/wefamasolunivosaza.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bqlajmvs9cuuhuqh27qe9ff260/pifovupejonexetejiw.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/wafapemurimojovu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abd246288d7---sedonomizimakofawogenab.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8248867d389eb68c6a644a4cd02e7add/55742045016.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8925e6ec7---80042627139.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_off000176a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A4 19252 bytes
SHA-256: 884a623387b2c199e26c01d8e7f52e3443f6815ef2fb097ff1a66c126cb35920
font_01_sfnt_off0001aa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C251 11472 bytes
SHA-256: d35eb93f15b7491dc8e1206d5bc13d276b03bd91a5cd48597ae5235f6ed78736