Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bc4e1cc65db8a7…

MALICIOUS

PDF

82.9 KB Created: 2021-08-29 19:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32f51cc1b1dd40a5fd52abdf58cdce27 SHA-1: 7fc744950a2b032f94aae27fa7d4cf16ac2af0f6 SHA-256: b4bc4e1cc65db8a74d81d611fa19097d7790b59d6d8485cbf57317052f5d7986
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160744a9716c48---wovibinigogesiwo.pdf In PDF document text
    • https://kurek-rowery.pl/user_pict/file/vewakinu.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/505878149.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/48306378618.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/nefululirotesata.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/xorovulafa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/banler0ofgnsfgiebeea13e2a3/24068210906.pdfIn PDF document text
    • http://flexa.cz/docs/file/16316005904.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/pivomov.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/lolowalijeluxovowuneba.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/96797517733.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/72094768005.pdfIn PDF document text
    • http://chinalabware.es/d/files/zotiduf.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/jafojemovelanolufebam.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/ruxadiwupufidenite.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/ginifafulopurud.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/d48769g1pr2nakgk5pk3upp7n6/kikuxig.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e5e9ca728decb281c5ecda04238b2917/95292159054.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/40687978665.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161155e03ed7a9---sizobis.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/cc02dd1a293487f5d9ef50897b2dd322/zutepetemudarumef.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/11310110479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+subtract+in+google+sheetsPDF 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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 10828 bytes
SHA-256: e708655649ecdcc5fab519e3661026c9f5e7a1ed00ed08b43dae23602cbd08c6
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 17944 bytes
SHA-256: 6f64843806b5f881361389b7a39e522cb9fa7eb9f40c2fa1e0c5fff4299ad55d

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