Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf32568249c416b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-27 15:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf51740a9299a7043982114f41034b22 SHA-1: c409e1c3065473ef8bb10564ef040128e785a35e SHA-256: edf32568249c416b57b856b13b6dee1ac53371d6ea702e8145fec9d02202d3f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to lead users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=sartre+el+existencialismo+es+un+humanismo+pdf PDF link annotation
    • http://studioindelicato.com/userfiles/files/xuxuruka.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/gaxuxuluwujujurud.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/xekelopuzili.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/gomovifumaporiwikok.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/7826521036.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/51927755018.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/ramemafabi.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/tefepa.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210922192858.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/19496867950.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/43969228052.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/zetiramoxisuwew.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/40985999211.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/tuzarapetufuxebu.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/29295325598.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/53165048207.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144239ca2354---93370717192.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/rewoxoba.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/sarimezej.pdfIn PDF document text
    • http://usagimatur.com/files/others/86336474668.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4e9f600c08c629dc0575fa423728e7ba/12999868591.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pusomebubulanepizis.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/97308137661.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/20ad967c1330ed82c85d89b55b14619a/89566110349.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/33339438250.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_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 17536 bytes
SHA-256: d5b0637f2fe97db0eacec567b5a72d816c14884ce91f45571418544d035192b6
font_01_sfnt_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 11164 bytes
SHA-256: b17177328336e186e02de95d2f514ca2ef4b1c7210b586cff1ad5a044f068c96
font_02_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1