Malicious PDF — malware analysis report

Static analysis result for SHA-256 0215387c441845da…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 02:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a3c50d50cbe8bb63a61a0ebb8fc433a SHA-1: 932f6eb18e6048bdf7742a4758c8846e6cbd5c1f SHA-256: 0215387c441845dada5df70b2009e62b44084951c7c349d4a60f2e5e1ecf7b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics strongly suggests the intent is to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=mods+for+war+robots
    • https://pcparts.fr/ckfinder/userfiles/files/niwijopupumivefosim.pdf
    • http://pathtojanna.com/userfiles/files/muzojawerenukunazo.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161369f0b6c5da---22853829411.pdf
    • http://eszixv.hu/ckfinder/userfiles/files/5695720343.pdf
    • http://kartelabasligi.com/images_upload/files/9914923472.pdf
    • http://allasclub.com/campannas/file/bufalorotalerek.pdf
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/juvitokejetili.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddc8d7e84---37392521437.pdf
    • http://filippodelvita.com/demo/userfiles/file/nejonutupunamemipu.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/68067592106.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131797e099b4---3997453102.pdf
    • https://premiersuli.hu/files/files/xudasimodur.pdf
    • https://shatalarab-llc.net/userfiles/files/56083310427.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/49197163194.pdf
    • http://studiozammuner.eu/userfiles/files/46098235545.pdf
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/zogorebufalizobipamaxire.pdf
    • http://modamoda.nl/uploads/pic_lib/file/dugozuwigenudeno.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a7be91d24b8d0aa26875afb3fbfa60d7/gebosaluki.pdf
    • http://botosani.ro/img/uploads/file/moniwatozavivogejigalanev.pdf
    • http://futimisdev.com/userfiles/file/luzuvalow.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/00c1d73bd6bf16057df3f5f349e182d3/bovanuverubes.pdf
    • http://shengnabei.com/uploadfile/file///2021091609360424.pdf
    • http://mstreatmentadvances.com/userfiles/files/797528169.pdf
    • https://e-tta.com/app/webroot/userfiles/files/regidikupufugafepoxigawap.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_off0000d7d1.bin
13b1f6add06f1763f3a591be804586103aba5d6e66467d86516a84f3af976923
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 18208 bytes
font_01_sfnt_off00010740.bin
2a4eb2457241d365f192ea1f0bfb1556c181f851ed521386bd1287ac201cf4f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 10192 bytes
font_02_sfnt_off00011e4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 16792 bytes