Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c859b5a26f4f3b…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 20:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e75969067d4bcc4058deca8d2019152 SHA-1: 5851aca786fb3d1f9fcb4b9e226d83f5f235c74e SHA-256: 42c859b5a26f4f3b479855fed4d0e5b8eb080c2b3838c08318a14f46e825084e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://impeka.lt/components/com_mijoshop/opencart/image/data/files/dikubasabu.pdf In PDF document text
    • https://psfund.org/public/uploads/files/cms_files/beribij.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/821d460d2c2f80b89f2a3856907d4f1b/viroti.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/75300901030.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7uded1nu7cj3n2vmh5nb3lp6a1/59276981480.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbb8ddd825---zodadafima.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/284bf394a7ea1bc734dd1de626c185b9/xusizubuzuwagewon.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/katavajoxew.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd2b275dc---wabuwuxu.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/dewakeminidodomexedaxiw.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/1614399510.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/vukufitibozowisuwafomapo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739243cefcb---loluzafuxem.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a845c96906---98827483265.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0eho37j23mq24vpkfo0ruu9571/rodokowepefigefakuzopoli.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c136c39f469fc4158f2459b1e9044a61/nevegor.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/lawemejogig.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9f3cf3c9eb18c33bfe0f6bb7b9f55e52/61224681476.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/2ml2hpb00g00c26h9gtth6tgk6/kuzepinukeluvuda.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609067c8347cd---17750500247.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5d26784d9e8f86930842f0005fabff01/30555329406.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b657a2134---63996046920.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/vavudalaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=causes+of+demand+shiftPDF 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_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 10604 bytes
SHA-256: b146a3c4b1504515bcdebec0759964699419f61e6050c2e73088e472096047c9
font_01_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 17160 bytes
SHA-256: 7db197ee39b9bc919965537f62d37ab71673b7d41be0888404edca4e8335740e
font_02_sfnt_off000157c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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