Malicious PDF — malware analysis report

Static analysis result for SHA-256 8147b434c2ad2ce0…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 09:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba2935c334ee62f519fb08781a7c8ca7 SHA-1: 4efaf0a48e0c562d001b10ca677213bfff97a534 SHA-256: 8147b434c2ad2ce0b3cb6499bc3891cb8249c3472e9c0b3bc15faaa4d2693789
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://o-dance.com/upload/files/xavunolezezadixogukebumef.pdf In PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7acd07075f635473bc890e45e0e11494/morotad.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ca386122fde46677b06af94cf78066bd/46861135134.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/jafusumixoji.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/11c075e97cfbe20cd1b8d87ac1867f8b/87179443650.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b15a6546eac---95139118884.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/gufipabubodewoxenujunan.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/nafexusuwu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbe2360d8---demal.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d73dee137c60cc17ef58d98abf4fc06b/6010451639.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e32b35cda3---tezetudosunijezafezol.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/21674013758.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/rapunekimezusenowuw.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/xagozosuxizexapewazovo.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/95051619770.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b13f839f4f0---84905365083.pdfIn PDF document text
    • http://eichler-kammerer.de/14693214814.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/99470872113.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f395b823---12182498956.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/tebufo.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/45071528901.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/zotogititogidazom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7484175525---zoxorolis.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e545345b---xagokejapirivekugubivike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=reading+intervention+worksheets+middle+schoolPDF 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_off0000bda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 11108 bytes
SHA-256: 3e6ccba8443cef99df92ce5133a42b0695789bf1701d683a4b4562165d6e73cd
font_02_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16592 bytes
SHA-256: fcb0377532b4c2d63a2d9d07695c2da2df5e29bdcfb6b14a91ccfddd495d4a38

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