Malicious PDF — malware analysis report

Static analysis result for SHA-256 107c4ec9cf1fd634…

MALICIOUS

PDF

93.8 KB Created: 2021-09-07 18:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b3f2e7e3548335d6ee6609627b709ff SHA-1: d0c5e08f2c395e6c217731b9ce098d9973105d44 SHA-256: 107c4ec9cf1fd634fc913a234a8673bcdd4977c60604081b05d0e1ab250a9000
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://laborke.ru/uplcv?utm_term=vehicle+dynamics+theory+and+application+pdf PDF link annotation
    • https://kubermatkaplay.com/ckfinder/userfiles/files/24489396543.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a3967ec64---57370882400.pdfIn PDF document text
    • http://freeski.hu/freeski/file/duditofadumesupolaraxajum.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/ea52738eabdfafe35d383005ac2b5c09/57809765442.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/21870446559.pdfIn PDF document text
    • https://073741256.com/uploads/files/202108241613025074.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/36603884453.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b92b60f6a---lajapedube.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aa57b4be9---82385988405.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/noxinonurasebuzekiguxi.pdfIn PDF document text
    • http://mextro.de/upload/files/82921294232.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/fikekaletivawig.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/40376969958.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/mulumijixabovijiku.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/e3vjb6ivbngvnffr6icpseu6l1/75454285153.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/59703034926.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaffbbf152---govake.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d3cf3563---rirubagipisukezexo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2f9e268a0833587780ba05d99b7b2167/70641538356.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/38284259041.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/giselofezitavavakasu.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1629342184.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/142012245294.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2247bebd---vulunasu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ecbac2ea8---kabotexuxog.pdfIn PDF document text
    • http://yaheardfamilyreunion.com/clients/6/6b/6bcd2b4031d0b832efcfffe4b90de728/File/39956510165.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_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 10968 bytes
SHA-256: 28fbfa42543238d8a2a5bd825795fe8b78d5214e6e72d4148cddf572d934165d
font_01_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 20888 bytes
SHA-256: c3e20b3860b202d5e8c76fa116dc7508e74288b2d2869d43804d47598390b1c4

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