Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f73720371cf44a4…

MALICIOUS

PDF

83.1 KB Created: 2021-10-08 02:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 97a094195b94b1c14a02b7c3163b3383 SHA-1: 741ca9bbeda3d994ce88567feb249497db4fa8a7 SHA-256: 7f73720371cf44a401ceff4424d16e0ec10287cabf3946fbb5a318c1e2c1dff1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external, potentially malicious content, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://silverspringabw.com/uploads/files/fisegajuji.pdf In PDF document text
    • http://dexgerm.com/data/file/userfiles/files/59225535816.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8925c929f7d715e72cca002996a28aba/tasotab.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161319b8a5e2d5---tuvirarusafijulonak.pdfIn PDF document text
    • http://corkpotters.com/images/lukofafu.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/risinewenes.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/19540111650.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa6460362---28717108479.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/54155367613.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/2063763653.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/76281678807.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/75864094350.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/17976805872.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67296323424.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/tijajiruladop.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/xokomitufamuvusirid.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad203f64---lemabenit.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/99862687131.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/58389792025.pdfIn PDF document text
    • https://europartner2.pl/uploads/zatugasamu.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/69479336007.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/bapanajunanodubagatuwusu.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/voxesowosoxexajapajakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+a+tnt+cannon+in+minecraft+bedrock+editionPDF 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_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 19064 bytes
SHA-256: 48bfebf8435fc6db7e147cb51707d7c45091ac5ed67718859b61ba49a7f47c20
font_02_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 10732 bytes
SHA-256: 8e6cdb6fd2db05f3d9a99325ac710426799a14bd7fba73d6d4c1d7452a554434