Malicious PDF — malware analysis report

Static analysis result for SHA-256 758b6e25ee260ab0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 07:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d79dcfb724fcd6e9beb560fd69415bf SHA-1: e64c9e2e1086619b79b9f756bb14c5541de04b24 SHA-256: 758b6e25ee260ab00ba4954198335ac5d27ff978d131f44daccbd9e3fd9bf0ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ketchas.ru/uplcv?utm_term=thee+slayer+hippy
    • http://zhuoer.ltd/userfiles/file/10821906508.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/89a03a28d739f54ce7ebdfbe0503b136/27149620763.pdf
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/tulapotitam.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/69d25a4043ca482ab9b3144c9cd8f2a9/gulonosod.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dba91c220---xolarojabazuja.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091e2969d50d---43296474519.pdf
    • https://bandotrading.com/uploads/file/simebito.pdf
    • https://geneticapanama.com/userfiles/file/tunivoremaneburotosikar.pdf
    • http://splhardware.com/UploadFile/file/2021072505534773499.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5ccd17046720a63be3ffb2b8f575f4cb/pudusozogamisopimu.pdf
    • https://coil.hk/upload/files/begitilaturiroxarivoxup.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792f158d796---92004823025.pdf
    • http://fitviewer.de/files/file/62792319464.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7da2a979d9bfa30b8fc7730d7db91515/66226085260.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/57429720690.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/93ac2dcb2d69a9ba72db218a79175b7f/68501017449.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a89d61ee9---xidive.pdf
    • http://seabeachthailand.com/UserFiles/file/fijujojexez.pdf
    • http://szwygs.com/upload/towudofinuduvawemagineso.pdf
    • http://red-persimmons.com/upfiles/editor/files/23241252078.pdf
    • https://curewelldiabetes.com/userfiles/file/xamofenugorutupax.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/365d5c102c768145b12701aa0f294d0d/muboba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b96a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB96A 16792 bytes
font_01_sfnt_off0000d17c.bin
7ece80f160baf0ed9e3f67814be9db18d062aff9e5d42c9810f51f35ca96bb61
pdf-font-stream PDF embedded font (sfnt) at offset 0xD17C 17104 bytes
font_02_sfnt_off0000fd76.bin
92cc4d993e46444ef1e9167e9b6600cfd2497b332915f5b5d40e4dda631873fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 10104 bytes