Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf0d78678dce3a6…

MALICIOUS

PDF

97.7 KB Created: 2021-06-28 07:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f906c2f6fcaedc56627eabdd2076367d SHA-1: 4c310f782635df27e4c665c1cd0335c4536955b9 SHA-256: 4cf0d78678dce3a627bd41476da7df58abf92053ebfa9d722b47e6d1db901299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into clicking malicious links. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://inwebjor.ru/uplcv?utm_term=merchandising+questions+and+answers+for+interview PDF link annotation
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mcl95eo3doqfdui3osvu3kphs0/walud.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ff3e832c---kunaxaligaga.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f1d97844---17646251170.pdfIn PDF document text
    • http://synowka.pl/galeria/file/juvufarig.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076618d62ffe---fapuzigomisikijuz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792d939cb7---84870125679.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/44uhkhljfj0ia0te8r3g9l1edl/katibovuri.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/53728779095.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36e2ae045---ponaniwuzupigegiri.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kunagelogenigufel.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ccgm0nvl6d506h6ndghofi8mr1/sajiwuxunujev.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v3bjkfa0op2q01fkl3hlvrpjk4/tuzevuma.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/615g4v1av6ujtsd3e55l3abopj/96937097363.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9febd1f64---68196506305.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ao493ekhmvlqh5mv254kpnk0pa/gupebedebuwezuluzuwisal.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/37788436416.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749c090e1a8---52459566037.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/fulekulemobepavutil.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/kaxajepaxig.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3piesagaj7d1epgofath6bg8d6/wobewevubokazovim.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c254a24dbf6---vifipibotasufakixamuwena.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/rckcg4gbmurebe6hvscg4d5cvo/31213927564.pdfIn PDF document text
    • http://runo34.ru/attachments/file/8086104240.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/fef6e3b2cd2eb757a60d929d3bd016e5/57009873028.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/borebuvixaxukelaxini.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_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 11100 bytes
SHA-256: fa575bec2fb666d305ad964037c9d74a3f79ead682750c91c6d69598bd464b93
font_01_sfnt_off0001325e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A70 17792 bytes
SHA-256: 583794717f9b980bcf340757a6c08c390b19d804ea2823f81e0190ca30175b98

Open this report in the interactive analyzer, or submit your own file for analysis.