Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d3794a23226321…

MALICIOUS

PDF

83.8 KB Created: 2021-07-20 15:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cb9f84891a711fff4484c7cd71fb5e22 SHA-1: 84ab66dbb43cee4e16c8a0762acadb0195deaab0 SHA-256: 14d3794a23226321fcdebe663b0bc667c8de12b58b10aabeaed59a3007156017
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on disposable hosting. Heuristics indicate this is a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ih8vou9epjtggjjodclikv6sha/62103951767.pdf In PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ed1120c63eb179e78b19625aacc3fe2a/gekuwewuvu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/10fc34c06e1d6559da49181ff6082c9e/77435472025.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608607416c681---3258910629.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcdda5147---wakexu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/dojijapevuna.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/gosejelamigatikar.pdfIn PDF document text
    • http://sushi-belovo.ru/files/vusosisilopemokikatudeba.pdfIn PDF document text
    • http://yuha.be/_files/file/doviboxevomerus.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec17db36aa---wuwumiwuv.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/53430154865.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/40064543285.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/97292654184.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/lozojanux.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/80f92b2f282cb6f0eeb6a820ce832fae/84340316487.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/5940664211.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/15b4a989bfd4823049e677c24c221cb3/sagezatibokedofomepo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/11aeebe0be4f54f4659c9f265fd964dd/57422562803.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6344cd075---77658846216.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/m7djh38gjithv6g76qre6onef3/gefuvoxalinuzajagitiwefow.pdfIn PDF document text
    • http://dzbnf.com/upload/file///fewabekojapogapikudixokit.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/p3d6mb0lqjiu42j73ilh93c4ur/kujomibotolejekutotarores.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/sidokenikabusosovose.pdfIn PDF document text
    • http://ausafe.net/images/art/files/saputilumodexetigulotijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=from+bus+conductor+to+superstar+cbse+pdfPDF 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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 10860 bytes
SHA-256: 64d9a2335fabb25d18ac5b302a65868760eea2b831e4d3aaa0670e21e1774bd2
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 17656 bytes
SHA-256: f0e7ba9756a25e9a9da69cc7fe133e0d4a16a1f75385e147f7d104880760340b