Malicious PDF — malware analysis report

Static analysis result for SHA-256 199f26a9d389db3f…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 15:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2b2745c7e3c5dd202d6e8f50e8250bf5 SHA-1: 80e3913429db2df5fec077b7d109c679a166ae3c SHA-256: 199f26a9d389db3fc5ecfdaab97e23a508ea3c7ac2ad9c7c6b3c0e42ce64f663
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting. These links are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hl5thh8jtgi657f1mbqeqvg65/14915551209.pdf In PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/nelinorolepetub.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef15909d9---somibewewoz.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/zamut.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e0b5fda4---51958937012.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/rivozofifabikiwifonive.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27b2f2643---10232256629.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c16122465---65950857487.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/69367594547.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c092db6e9c3---dewazi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/lovubetebeg.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609104227098f---xajedadilebodamikibu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c80bedf3f528c4dc518bd8844da31ee9/88485576465.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6eb52980---52508157869.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f4f75a2a---kutuluvapuxe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a4b40a93---64267922805.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/91776543873.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/puzofuduledajuzule.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b74892915f5---kosenojizuzumu.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/tososuvalabojipujolafan.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b834a309fba---51841747900.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6utlj675jfh1gibsvktku0gq9v/dawidodijikekunojumujezap.pdfIn PDF document text
    • https://o-dance.com/upload/files/67145858686.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/wowozivabikiputugonov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=of+course+synonymPDF 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_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 10336 bytes
SHA-256: 4ff169c21e968f8a0e5b55928e7b0a9e73735a1195c547af54cba136d53d0229
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 17844 bytes
SHA-256: cda4a293fb46574a36bcf05322cb1f9c20d60fa1115ebfdb9b0add74d093fc60

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