Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fb3199a7404dc4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 12:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ffbf53a78e94c86ea46c734d16a0b9dd SHA-1: 2a149639e5a1a614a1fc316398ac45452340caa6 SHA-256: c1fb3199a7404dc441059b56431413fce5c2fb9fdaff71cfa8cbe238b4980fc3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm or hosted on compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=how+to+install+otg+driver+in+android PDF link annotation
    • http://diakmelo.hu/ckfinder/userfiles/files/3611784920.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/17908316562.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/5907185229.pdfIn PDF document text
    • https://ptogel1.com/contents/files/podogabijanufutorepoxudux.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/lananowugo.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/72570558368.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/gokenine.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/fobofepu.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/negumusudovofilumaso.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135064ed2e65---83258459237.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/nokerurezix.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/78998806891.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/61bec622ca10530449899048b11634e3/66759463807.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/vezewedepu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c35725b433092a3cf560a8f026f1636/libum.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/23110764097.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2e4d90572672803e40644bbbb09809d2/sugot.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161318f14779ce---91800121850.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_113634.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/73172293740.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/52104102226.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/93807925081.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/21358036647.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c4f13746---42498259865.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d045a1df2---mipexakafavomu.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210913001807_60grak.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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 19084 bytes
SHA-256: bc874d1ebf300c4608de3ab7e673caebd6d1abf21ca5001f89519e537c8b0290
font_01_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 10568 bytes
SHA-256: 25dbe48449f3264a101fa2eebf10c33584eae024dd9c81fea1a302eca8d351ed

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