Malicious PDF — malware analysis report

Static analysis result for SHA-256 331370b573663a3d…

MALICIOUS

PDF

96.8 KB Created: 2021-09-03 11:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8daafa3ce040d7ad64a1f86d5a5d80e SHA-1: 4c0eec278f55973e616f6465f9fdd3cb6c5ec416 SHA-256: 331370b573663a3ddcdb9628ac7141c0a2f486da5bd6d61a5787e8cfd8a2a6f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The embedded URLs and link farm structure indicate a likely intent to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://plan.msu.ac.th/ckfinder/userfiles/files/97408445090.pdf In PDF document text
    • https://kartplast.com/resimler/files/86316947756.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac5bd40dc---kisotu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/dikujubibam.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fumosokejofidisuvo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc848e30cb9---40453741253.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/47200717340.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xeneguxejetetudavukag.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074a410e2863---kubudewizapep.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/56903764010.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608829baa32fc---42093947749.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/5800288952.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/keseji.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/99439552011.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ea6d9863fa891092ec5926e572c9fcc7/4660846952.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/zipusinedujeroteroroj.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/31712853677.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/apkpu0m3911bjvmquaaim9ar7h/mipejegimesojijuroz.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sukivikubose.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6abd6c97---zuwonab.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c602216fc1---24085357876.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8hmtd33jvbfk1d1j8huu9jogeh/medudaf.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086a60cacbe---sozulokesukuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=percent+composition+and+molecular+formula+worksheet+answer+keyPDF 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_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 11280 bytes
SHA-256: 1f6f9379ee6c8bc353cd322efc7aee5df8f65cccc87398a9d5f2c549460188c5
font_01_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 18512 bytes
SHA-256: b6e123d315dea5d823ab5ffb719d08303c3c3f50247c18945f07e5f094a6781c
font_02_sfnt_off00015ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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