Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bccf90c68a09c50…

MALICIOUS

PDF

146.4 KB Created: 2021-07-22 00:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2245cda9a92763fef29eecb0d87eb3aa SHA-1: a265d971f25d01f43c80cb27d4e0b5f61cefeabd SHA-256: 1bccf90c68a09c507e7d7f368b8a0f020c13b87f04338cacc7291946502c7d15
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or second-stage malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature through its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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 http://gd-weimi.com/upfolder/e/files/20210530041727.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608042431da1d---21420023514.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c646efa816b---4936457826.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/17404978572.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81e0079ffb44cb9e64d3a84141134baf/sowobu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/11850129896.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8cd70ba51---94535968674.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f7bf16875d5409f7e92b6882999a2516/rebusiwos.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/pikapekowinewus.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5702fdb6756d723359068bb326ee21b6/21929883601.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/wipevogenumovigasadom.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078af57ec181---pumitunanavivuvunumalu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2532u6scpj1tp5redgm13d7r3l/jurenawizuwetarimomovofo.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/opv6mbs5vhbn5cgitvo6bmbcvf/jozisusodabek.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c619234fccb---gijagokalik.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/350324a5729fbc98a558ce6ead7d42a3/vematoja.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/33504993110.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u1iu26j7jc072vo5m079thofb8/21222343347.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/82626250042.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f7852ec1---viviragokupelureb.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/nawezibuxodejajo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ab9b51cf4ce474b137a1febf46e1e808/jofepakokunajufi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c0908a9edca5c3027635903d7160a62a/fekuvilofimojisuzonaxufas.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/rokawufizeposukim.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/c2v4os2o6sdasg8cu1qiqrtbv0/kezujovabidugatinijez.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/viduwomixudit.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/guveberitalamazet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3+stages+of+photosynthesis+class+10PDF 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_off0001d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBAA 11020 bytes
SHA-256: 66aee034d27e2c351c5411dc33b5fdae39933c65b5d6246f4dff639980712c67
font_02_sfnt_off0002054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2054C 20456 bytes
SHA-256: e9504094e4418000d422d215f65192efed9d0040593f484c85cf2022d5383fd7

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