Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd8f88a3d75ff45…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 15:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8f37735cc8f1048998e57e131a649fe SHA-1: 943660d92b7e6b82e3c56408a5e0423d8f465c08 SHA-256: dbd8f88a3d75ff45a3c0f63312be1ff2b5ed420c01bcfa7244319345e2736166
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 domains, some of which appear to be compromised WordPress sites, designed to trick users into downloading further content. The presence of external URIs and link farms indicates a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=game+of+thrones+book+1+download PDF link annotation
    • https://telechips.com/ckfinder/userfiles/files/taredijuxerupevivarobufo.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/85147561752.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/tusebejafukuxuvuli.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/13748828462.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/sezipozizimosuxuli.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/19911675794.pdfIn PDF document text
    • http://cwesp.biz/upload/file/75454807021.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/tuwozasafe.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/benudibikuforazatolasar.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614955db786a9---tepawubobejutu.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/pudumijasizav.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210928003025-xakadujewilozutedijel.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/31027101673.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/44534198865.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325ab9ba089---fonuweperofonasasadiso.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/61181842388.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/moviwugarabi.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/46383547233.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/gidofumilokubizid.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/89462222132.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2478ef680f0e48e554ead7c42123da06/bubelivuli.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131705108bc3---12912800869.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/rilopefinagegipadokoxi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/revamizesifakonavobadalas.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/76273263121.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_off0000b5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F8 16580 bytes
SHA-256: df5b4dffd4a03a8f77a58b0cf77708819f08f26e0111b3e5b01d93d8ae5411b3
font_01_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 10936 bytes
SHA-256: da5a7f2e5ff9fba1cd7d58ae6d4598e87e744f5028fa93cc49d0aef2a4ea54b5
font_02_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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