Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4abb0870bca4d04…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 04:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e550eff810c992b5bf96181fc6d984c SHA-1: 98f7621b1d6464b3f8b7bd6f6a6a7db79f5f65f1 SHA-256: e4abb0870bca4d04763c7d388041fafc698390a16cb009255acb30f06f8a5d21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised websites, suggesting it's used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=manual+pull+station+signage PDF link annotation
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/b88pic4besggca8786qfsc7uco/59269874851.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/mogofopekatonodala.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/gaxod.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/97024605038.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5460752d6---51813352487.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/a482d0bb9b929ecead201800da773b36/xabasojowulaxezanoso.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/20889387828.pdfIn PDF document text
    • http://santabruna.cl/upload/file/12459426266.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16110a44bbdd3e---nimarekuzus.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161084fb687b63---25723152926.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/pio5anmvbr707q80jbi7hcug85/82794835865.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/potunimibaxopifafejeko.pdfIn PDF document text
    • http://becucci.it/userfiles/files/85391263504.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/qanklv2vvum83gr8tbeauolo64/34667505303.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/80090999509.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2122c17bf8174ba50577802d098ea5fa/rudun.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/40269a2d30be1cd4b6f8c28478f2e75e/41953996939.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/57d38b736921264f7b5e34b94b94192f/kagusopuwalefejepunaked.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/vepetajesapugowebupos.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/51075753790.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/46518118841.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a5ca1d2f37c8421de39b80923f4008c7/7829554847.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/sotoneburemow.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2fcfd8e2b---18961632890.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/jefuvam.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/28685383109.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10420 bytes
SHA-256: 7f17a46a00250dab2cb3c10b5a2cc635588e483f13e0f2fe32742cded3897448
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 17608 bytes
SHA-256: 9b2181823e2d5b7b3d8207c2fc3a536449ced850233d7cec69a97865380074c2

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