Malicious PDF — malware analysis report

Static analysis result for SHA-256 522784195fff8b1f…

MALICIOUS

PDF

91.8 KB Created: 2021-08-06 08:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a98cee8a2863bbd6fa5c11dfb0b317ab SHA-1: 55514b7902271f3d85ec801fd3ba8afda44839da SHA-256: 522784195fff8b1fe46c760426b6c223c8a183bb8f46a56160efd964b1b644d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://cupta.org/userfiles/files/20210527222813.pdf In PDF document text
    • https://airshow-bg.com/file/jedesizabimer.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/565cb47879e533e87420b93fc6c63eab/fasiwupoki.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79d01e3912---gugekusakorut.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c2d468a2012dabbac34c9024a8d2c50f/32714538077.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/4219250cc81a18fbbef39cf3ff5c73a5/82194529764.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/gilixuzepe.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9610ba7c47---duporixazomur.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a7177b4e---wunedebaxut.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/80792475335.pdfIn PDF document text
    • https://bursac.net/userfiles/file/71347160792.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xadizowemovakuse.pdfIn PDF document text
    • http://humanlitech.com/files/files/18671574963.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/835942a1c738ae5919b0f2a64c202186/48442091605.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/agbm9arq48n6s4q6domotjl4c6/givoja.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/dapazonesuwomanesu.pdfIn PDF document text
    • http://fteq.ru/files/file/1679770868.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/62568702998.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/paxop.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/26b10b6a80f98267ab3165965e52762d/32943307379.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fca6a0e9e39---lokinitolifizame.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/mesuvalidiv.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/749ad39b819c23caf503952b1965f13e/pokafezaruvodujasawi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087de7d1d2ec---11840286470.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/ramedameb.pdfIn PDF document text
    • http://vtaky.sk/media/file/51850914157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+ask+for+follow+up+proposalPDF 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_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 10292 bytes
SHA-256: dc5847fe98bb3dcc8035adc080752df6a46f7f0461a4fb55fb9eab3e65140a1d
font_01_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 17428 bytes
SHA-256: 82ae6c290b459b7613706fd32c84467a9773a68018ca0e766415b43fde10322e
font_02_sfnt_off000147f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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