Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c595c9e99d8dd16…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 09:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1e8433817e293326a034e1f39abc558 SHA-1: 9bf3cd04a83c6031bef8801b562c9ee7e80b08d3 SHA-256: 7c595c9e99d8dd162bc735811dc51bd3a3eb96b6c3c0c93dff1d5af455507734
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating an attempt to redirect users to malicious sites. The presence of these links suggests the document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://sistersaviopublicschool.com/userfiles/file/kediduxiwib.pdf In PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16311435418476.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c458140afa---58622114298.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/77658839976.pdfIn PDF document text
    • http://besteva.com/upload/files/busirozutawufazepa.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/75673314397.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/48779046037.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fa76bf62---sififufofoguwi.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/20839819370.pdfIn PDF document text
    • http://montesantangelo.it/files/files/fudefubobivurino.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/2687692327.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/gimaxawojazofulovuto.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161359b5737ab3---18095505526.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613756be6ff44---bokupise.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/suxonofunalaja.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/gapexe.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040146125835.pdfIn PDF document text
    • http://imoroz.by/upload/file/27015555584.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/38208698351.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zerupejijivigapo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a0c519736975ad8b9bf1ba2060fce8bc/befeka.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/tusum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134624252fdb---35483100662.pdfIn PDF document text
    • https://stotex.rs/files/54086962051.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/joletuzekuwerowanojub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fce+b2+book+pdfPDF 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_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 10172 bytes
SHA-256: d70eef5229b7f842a3cb7798711bc229418306fce3842473af0a220988fd2fa2
font_01_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 19044 bytes
SHA-256: 6799e2abbff96b02dfde5523b8b6e3cd7d90f540d86ecaf8cbe1030f2a1da69d

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