Malicious PDF — malware analysis report

Static analysis result for SHA-256 89736170c2703dd7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 21:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88254c440198801d43c1fb8d428d03af SHA-1: 55c7d6e997603fc220bbe9be5db2d44fb3aef948 SHA-256: 89736170c2703dd78a78f36bf12fe1a4cce44c7bd103f2c8e0ad489a6a3da344
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a tactic to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pistant.ru/uplcv?utm_term=redmi+note+9+pro+call+barring+password PDF link annotation
    • http://moristas.com/userfiles/files/ferisokonidamamezeked.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/lomisevebexa.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/41474427369.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/jinutabimuxivalowofudep.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/39611845600.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/01d6f3073cc6c37f01001539269dd323/37129764202.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/bubuvuzoponezazi.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/jonaponuvilafedipotodev.pdfIn PDF document text
    • http://tochuchoinghi.org/files/vitewedopefotafisemomivu.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapowilamewowidavubivi.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/virakeduranip.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907222405870575.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/32819610659.pdfIn PDF document text
    • http://offerparts.com/upload/files/xuluxizo.pdfIn PDF document text
    • https://tckontrola.hr/files/10524650744.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/48442434092.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/demelagu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad55569018---pisoratuvularemetazi.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/pobuvubasikinatitiw.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/18421548218.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0480531e0007e4461299ece7d4a797be/segipom.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/puxutinasimuxupagimi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16143f79279d72---244749336.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/nanogobuzaboramop.pdfIn PDF document text
    • http://prota.ru/upload/files/kolotabawikor.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/32429073776.pdfIn PDF document text
    • 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_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 18932 bytes
SHA-256: d94b98cf60c303071c7982d764dc369a648e54f432b3b1b9229f789678d96ec5
font_02_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 11296 bytes
SHA-256: 5cbdba6006479a036fc2b082487074fd590e45be802897c8adbccc60fcd3ea8b

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