Malicious PDF — malware analysis report

Static analysis result for SHA-256 393b931db2cb3ca3…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 22:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cdfb1e3d8fac9fbde268a7f8e6ff447 SHA-1: 92e8b1475007098c8a5056a5e8992d4d0ccd27eb SHA-256: 393b931db2cb3ca3895ab69145593a0e372f0081ccc055fd9cb2a0cc001df65f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://1snrpaulista.com.br/ckfinder/userfiles/files/rupazidorejijanen.pdf In PDF document text
    • http://medeeatour.ro/mm/file/94476933982.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/lekupixajebibofobakolapef.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/xubojupa.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/sitamugemosevafij.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/60810761437.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_041042420D2AFBB0.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/78715642152.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b3404cd8a13493ec4530db942692bdce/31710368885.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b90d9866---vezexugafoba.pdfIn PDF document text
    • https://oasis-travel.ro/files/13982527758.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/70963380149.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49778532130.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/bujodazulin.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613de302b7fd8---kolajapijowumonowog.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/nizuposizi.pdfIn PDF document text
    • http://saimiri.name/upload/file/vekol.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/faravegetijezep.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4270d3c131f95ced68956b94a7ecacc3/domipunufusariko.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/mesagejisibazekojejivavi.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/vewibawukexawozas.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/17398935657.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/jenonimajalagidivos.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/82196212702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=super+zoom+hd+camera+apk+downloadPDF 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_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 17660 bytes
SHA-256: 617b2a4a9d165ac0d1c18370be0187662c57eff5861c4ac4f472905314c18565
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10836 bytes
SHA-256: 641818e589e6145b972d7887404b7aae2eabf3b6289a2fd140b367de20b6dcfd

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