Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b040857f496cecf…

MALICIOUS

PDF

94.5 KB Created: 2021-07-01 14:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 711e3d27ff9a7cdbe16bc8584a7823bb SHA-1: ba2e593a1478160e0c8a7325fbd2c2b8f2eebb1c SHA-256: 1b040857f496cecf813729ef2c7ad8b930c09e21ef3ffc17ecb608a92c223d81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary purpose seems to be directing users to these external links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://highendschmiede.de/highendfiles/file/66030187925.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074669a3ac79---nutaj.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a3ba88cffb97e6463be20743de0dd6d0/81839535567.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1181a0443---73805708959.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/sbtesg95t164d95t9lbdvb5i68/tomugexetaburadama.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160881dfb178ea---32765355178.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4955a940---vipazipikenavewagubo.pdf
    • http://www.colormotion.cz/UserFiles/file/gudofewut.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3207da163---sisenibigezupejexuxofas.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5adb93380b050691c5ab4a6c9a108149/20235048358.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/q8j0tkej3qpkt80f6tafuoges7/kavarumegevewijewerate.pdf
    • https://kund-in.com/userfiles/file/23447081903.pdf
    • http://compsult.net/userfiles/file/loputizadegopolomu.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adada17ad28---detoke.pdf
    • http://domainecomps.com/documents/files/73858990241.pdf
    • http://alkimosgb.com/userfiles/files/limemirivikimozopelenuz.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1160a5b8---modababilawu.pdf
    • http://clairvoyantinfotech.com/demo/images/razizavaza.pdf
    • https://bdaudit.ro/userfiles/file/40760704966.pdf
    • http://samtekelektrik.com/files/puvumotakiwelexomasenifak.pdf
    • https://e-uchebnici.com/img/file/sesozotedaf.pdf
    • https://sinhadventure.com/uploads/file/33909333207.pdf
    • https://egyiksem.hu/uploads/file/sunotanavodan.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0fafa8692---93710122469.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075e90ca7686---33695471444.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+deino+in+pokemon+sword+and+shield
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae2d4ef47---retabakabuvimam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 16792 bytes
font_01_sfnt_off00010c6c.bin
8fe3be744d9708141b0a556f4daadb173b418f328a8ada906c3803047a9823c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 5980 bytes
font_02_sfnt_off0001223c.bin
f85d579233fe71c5bfc3248f22394047bd1b51aa39a04251be8eff7c43efad2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 11008 bytes
font_03_sfnt_off00013b6a.bin
6703c8a7fa35f6a062f9c68c647fab0795a49c702e0b317feac5c796e55d75c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 18180 bytes