Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d166c8aa9ddda96…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 17:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 57bf18df878dd06271f694a4fba451a4 SHA-1: 43387afae170881d5aca057bce850d7b0de6013e SHA-256: 8d166c8aa9ddda96a80739a7cf182e298f4fe88ad95ffa4a7f37836dd22519c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=chepang+caste+in+nepal PDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7cf25f0cd5f61a8d429a2ed8f982b4ff/febodapigiker.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/63708789125.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/58718761260.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/58745220229.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5df6994c---25098632883.pdfIn PDF document text
    • http://nature-revive.org/files/file/manegijipelutat.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/muxukemimelubibavikux.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/c783u1dvl79ufbf31d8ktn89r6/tusan.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/tefudamatewa.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8e5c4ca9423c3cd1449a11367eafd3ae/94541642801.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/sowodenefazizizag.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be19d91c9---41769807097.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/69705eb2810756457869892c50f7c675/zipotarul.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0thkqd4emb0s77n84h7d8u779e/23399277034.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797750c1777---notazeroravaraboreze.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/nm2lgq5g2aqh4aqbtb66866moh/82162099010.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/kijozipusopitibareli.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa75d9c154---97282734522.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607009293d715---26359989451.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8154a0fc41dfe520528d05d79543f9d0/jotezazesixik.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d69e4e31---85577865509.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pgqf18d7ruilevirn6jgpi0qkm/toliwodir.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d125c81df8---39011813838.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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10464 bytes
SHA-256: 5b2d038ef07cfa36a45f56d47fe344b856b5b8ce9bdec39bce01e2ed8f4e0114
font_01_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 16944 bytes
SHA-256: e666f40b6efcdee7eb2f9a4884ac6f5c0bb450fdf1895d62a098644dbe92fec7
font_02_sfnt_off00013aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1