Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ddae28bb85680a…

MALICIOUS

PDF

79.7 KB Created: 2021-08-25 06:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57addadae06b010b9074aa3fa25a5dff SHA-1: a8b706508e08be01b73a0fd4924a89f4e9d2c40d SHA-256: f4ddae28bb85680ad9751928c86cd40681745b60f7e90cde18993f73fcd12f09
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in directing users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

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 http://namlongprojects.com/images/uploads/files/kixikawi.pdf In PDF document text
    • http://www.moyekolodin.com/files/95822833227.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875924ec2ff---14419793528.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/nubiditonexiwik.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/da59cd2039e8d4ece5fde24550197188/92431221341.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73e5c8e7b---zexonatam.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/56156030190.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/161072ab6d91e8---28861024144.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/14408630409.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/zijedimetatapopi.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/losepemexezapafibamiro.pdfIn PDF document text
    • http://raljob.com/userfiles/file/29639197104.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609180b42aa31---sibalabowebiru.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/jipasutijazasebanorutizir.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/36593344906.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/lth9n1h0fu8nd4cfu0essl1pop/jawuva.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s5b4k3dqvrveejfug2gfgopibl/josejorotidu.pdfIn PDF document text
    • http://spbi.cz/res/file/26671480701.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852c764b69f---pawod.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/674c42c40f3f3c9c9807e3a6b0c6c848/jemezido.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/96334675994.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160964f3454773---10217088663.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6knktuft3bgu19satcic6jshjq/66082186980.pdfIn PDF document text
    • https://sapporopools.com/contents//files/88626377398.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vebafomuna.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/dumilidoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pottery+game+apkPDF 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://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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 17024 bytes
SHA-256: baa47ca0b0c380d7013d70f777ac777dda43d08ce8edc091d851462accd695f4
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 10392 bytes
SHA-256: 1f1119a586fa50413d6b1467b6ffd62c2e1ac278346d1a60ccdc5bcea4237464

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