Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c133fc9c77641b3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 05:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef7f6da58b516fd3b6f752e783ba093b SHA-1: 501077896d2b063a624dd66d9bda61422a36e321 SHA-256: 2c133fc9c77641b3c7141bfd700ffbfbff93e05d22dc1a9ce36a33b79b89d5f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file likely serves as a link farm to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/d198b6ba562b36b0b4309863aa578020/14740058541.pdf In PDF document text
    • http://alacarte-design.de/userfiles/file/98809773373.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/baxituforadavodereb.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/mexizomo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/412h0cc1bh7pifba19inql5upu/sutuwaguledopekumuladera.pdfIn PDF document text
    • http://skupka23.ru/upload/m/gogemakoke.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/68161284733.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/83283267900.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d343ed8617ff206d5bf350710111d8bf/dorif.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/94d49863d44fc731a6be99af0b7ced0c/tefikijigerewawarutivasis.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/rb1sngk9p55k9cls4fpvgtrs5i/satevuliluvowekusamav.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a096b12c1fe---fajarisibefu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9416983ebfb9925c42b199831cf230c1/93030192885.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/34593801142.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ct8b7lqtah72jbpcrh82d5l0hu/kibul.pdfIn PDF document text
    • http://anpo.vn/upload/files/39757873514.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22da35e083---38891048763.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/89872802151.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/58142681808.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1d31b5c08---tudusobilofumagiviteti.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/56050707610.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/vowobojoteve.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vtn46n8m5hcbcqkglfucoagoh6/pegokagoniredapuru.pdfIn PDF document text
    • https://yellowstonewildlife.com/xugubukigonodikitem.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/binasilawajafupagakof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ryobi+miter+saw+manual+tss102lPDF 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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 11048 bytes
SHA-256: b9bda9e6a09d9b874749ba533ee77a0638a8137758bc86fc9a995a6fbea572f6
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16816 bytes
SHA-256: ca46d69a8500a133c2d475b037034b5599e4c3c5f48d020ced566482716f0d8b
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1