Malicious PDF — malware analysis report

Static analysis result for SHA-256 c319819de757ab43…

MALICIOUS

PDF

91.9 KB Created: 2021-09-01 10:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f91e9e6f40d6793a121b611a89c30b13 SHA-1: 0681932ea139946bf8bc0cc826f3ee4665a66992 SHA-256: c319819de757ab4394006ebeee2cc39384eadcc968a193b4fa427681eeab5fb6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://questyme.ca/userfiles/file/datexox.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/809e655565c31a2c81ee5c7298af8710/javawegitexe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c165fa22---56819196722.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c873c76c---76967130821.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/55036470261.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/goror.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/bugamatokubawelibovuzi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160780bea173fa---vogumevaxinifok.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cca0bb83e---zavinizojovanadesonox.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/vawigirox.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609039bcc1cad---9174060198.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/31262951287.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/xamejexikiluj.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608efd6b5f83e---nofawixawupewamuboviwoxus.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7dpubcuihbd1m3b4jgj7fdrb6/laxanunedozobime.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/73209814886.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ca2a9ff6a085b900178c6fd7d79b1fcc/46757439470.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/00829bba68e7329d0ae571703abc9f1d/34743920447.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c4f69484---gasobulubimifarumugexanob.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/kirok.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609560d7d8cac---72455575736.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/81607955d65e54cd59ed423da298a9a7/59742713049.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/946deb7f7c895d252dea70c87e773edd/xofuxogobuwovewojazuliwav.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/zunowel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=avoidant+personality+disorder+case+studyPDF link annotation
    • 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_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 10768 bytes
SHA-256: 64dcb5b1a182f520848efb812112354dcb6cfd722b7a8e189e1f38ce8a163119
font_02_sfnt_off00013247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13247 17892 bytes
SHA-256: 56c181dc6f8638acb582d3eb22f08dd87f0bbc73ce37bc32a96fb804b250b7b0