Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa5b56ec5e24942…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 17:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c25e8456d743114f629340c6c6200f9 SHA-1: 5ccf320a94c64d5b906cf5bf05e119230654cbaf SHA-256: 1aa5b56ec5e24942a729a982b0bf18514e8d6d6f5df6016c0b238f2d70b902ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites, specifically utilizing WordPress upload storage and other disposable hosting. These links are likely intended to lure users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a8c07303---1565566567.pdf In PDF document text
    • http://confidenzacsapagy.hu/upload/13841217512.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/rafovefogaragufanuromus.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/kibos.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/95397298268.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/6764657274.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/30375036307.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607117402c7c9---99227000415.pdfIn PDF document text
    • http://3sdent.com/upload/files/10472824710.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe05e8201---70455675180.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/45928780553.pdfIn PDF document text
    • https://bataretak.com/img/files/file/22982221588.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a034316a---xegekawopebumukanegu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/93667589235.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8a1650020---dulora.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/vusokurebapomewimiwijotov.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161116de86201c---68326395305.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/pixuxaperax.pdfIn PDF document text
    • http://keitbg.com/images/files/70518255539.pdfIn PDF document text
    • http://precisao.net/files/files/botatidosisanewurifij.pdfIn PDF document text
    • http://learningkey.org/userfiles/61455964771.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9de82e9da---jetaxiruledatimajik.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc2ec9c7b---18063176624.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/sasokokigukogebesoxeximiv.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/xugid.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/pajapidosi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9455ba90ef89cae70615875362bfcdc4/pulusuxojot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hymns+ancient+and+modern+pdf+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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 10972 bytes
SHA-256: 40bd922dad0bca90e53833b9b1c59d1238f58e3cc9e34a18be9f012033f294ea
font_01_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 17488 bytes
SHA-256: 9420db9fa9a327bfa723dc3142ae38e8f27ae0139c016484cff4cba11536988b
font_02_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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