Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a79738614d0f5e…

MALICIOUS

PDF

87.5 KB Created: 2021-09-03 10:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19477732377d8ca817bf6c5e62f0e15d SHA-1: 2683a2a1edde2cf44c701e68d3433aa0bd2d3645 SHA-256: 04a79738614d0f5ed8fb09bc16b6b46f0287512a5fd40d58a19e2f0f65a5f84f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting sites, designed to lure users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nazrabilisim.com/calisma2/files/uploads/lubelatikuzazolutazamuj.pdf In PDF document text
    • https://atvatextile.com/upload/ckfinder/files/dutotevirukepegavev.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/nabobubesetiru.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/41345678236.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81h0hlb8hq01uf8qdobo8lojv5/sinelefopagilofe.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/62319485101.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bc3c66987---tuwadevurip.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/lukavidugimoniko.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/40819538779.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/sloonj2avt2t4qsf3id6nra2r4/53924226961.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/dotit.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/kabutoniri.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4f9c0258---felukotitopivesawijajux.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/jawuriwezole.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7bccf1e0---vesonofujabozuruk.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210629025040.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9b47ec7f11b849161da5a76fcc94383c/lijivanafirerinalirif.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/45979360853.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3gq4dahj5s6dlke3ljf12bnsf6/41240768882.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b65f2c967---puwapokopibavubew.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e3914fb96d8---gabiburoludexevaluwejaso.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcc818e69d---pevavobopinukovir.pdfIn PDF document text
    • https://fasaac.org/temp//files/1851889619.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/62939067642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+pdf+to+html5+converterPDF 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_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 10640 bytes
SHA-256: dfe874f7b84055841a8df5d3a2b7b81111fe152e869e3e356539605177420c9b
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 17380 bytes
SHA-256: 1a55059116fa91eb6e808e5a513bb9d6e89a7ac1d667ca370395a11aeb5b4f5b

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