Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fca0c232e06a7b…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 02:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10ebc6b123c23ccd72dd0e3dc9a3952a SHA-1: 5efe0e67352077af96e5809aca66d9786a319254 SHA-256: 19fca0c232e06a7ba8266485e2d17e2990a846cd749703e1e10d03fe59b5cd78
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress installations and other disposable hosting sites, likely intended to host and distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with a downloader or redirector designed to lead users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://montaze.org/democms/userfiles/file/suzud.pdf
    • https://mdteam.se/ckfinder/userfiles/files/40879586505.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/watemenasibasujilufoda.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc17c300b7---nonejaperib.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/78b4b84adfaa4bafbf969220de4792c6/23004919579.pdf
    • http://studiogaleazzo.eu/userfiles/files/43534835366.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607949f244913---vugakulotovomituguxu.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/milivukogofigubelilir.pdf
    • https://werbemittelag.ch/upload/file/sixotivupuzinapojaj.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16083de404051d---22478050802.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c7093ceee---javufupilizonofutuz.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21a037168---95620232442.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f9d51762e355806bb5428e5a830f86c9/97723638583.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d5a35a86223ec67aa085a864164778e3/63880003389.pdf
    • http://kursadowicz.pl/Upload/file/49168866403.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/33niv4u1c3q3u6rr8q037k00p1/6146843711.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/414d9ecaf56fa0796041be1b783c9a50/kugen.pdf
    • http://shinies.ru/img/lib/file/tozerilawemada.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/55f8287b718c434b6b1149e916f4ecf8/53472840094.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6gbgi5ba9am3d5mar3a1rfe9o2/74557493005.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/437eef41ff45b7e83b256594264f6367/22472028409.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fdc851cea---xajeketupuxaguzoju.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/54a7c30bc671b2ca4dc8fb90443905ca/gugokuxolimipufata.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d64bea8a082---pujutuwaladumoninolubopo.pdf
    • http://4reality.cz/userfiles/files/3917154877.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+write+a+summary+example+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7da.bin
74ef98dff861b217e083e622fdfdf46636ac99aeb2ae5f4f38085c5775bc170b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 10948 bytes
font_01_sfnt_off00010153.bin
8d19ccd285a2b5d0837ca3848b87af9b53dae2f459ea0ed29d25c09957bc76be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16356 bytes
font_02_sfnt_off00012bad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAD 16792 bytes