Malicious PDF — malware analysis report

Static analysis result for SHA-256 198fc0e28bcfc9d0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 014291534655cb27e6da129aa8c05ea3 SHA-1: 800521490c55b33da8e76417a51b687fe583041d SHA-256: 198fc0e28bcfc9d09ae76d6d199d9ace13e9bab478df265306ce23a3f4711a53
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=federal+personal+information+worksheet+turbotax PDF link annotation
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/s0g46274333imp6l7i3erdgom6/motavidazomarajajowowux.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec1a415f7---mumatakowaraj.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e0be5e465---giviwofufifinipogubinafax.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9ae19fcbf79337e28d70369c8ef8c8de/xodorixagegiwibofawitij.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40126550520.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c951e2ab03d---fakusu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61a12edf2---gebenabizixowowemuriruxek.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/55042029470.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18a9c2e70---fexagejoxekufudu.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/runagifapafulelunenub.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/63020101634.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/5902367556.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/t3b33gvhmblbbmo3la2u8uko1g/27315164433.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dfc3d41c1---83810262955.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f6b951670e5ad1f7a9cd516784edeae9/fukezadoxesete.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803b0ed0579---ximowifo.pdfIn PDF document text
    • http://jarosi.hu/files/file/67389157757.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/80686646624.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d6534c96---71283284413.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/76370662566.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbb3ee411---berefifufaviliwozudifebir.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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 17836 bytes
SHA-256: 0471fdde6ff399addcedc926a85eb5428a71afd247531e435cf2f54343cd8ca0
font_02_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 11260 bytes
SHA-256: fc47c704639799b3e67d95fdb50496c83ce96f8a1fdc90c08bc96bdef9da24cc

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