Malicious PDF — malware analysis report

Static analysis result for SHA-256 8feb474278b52ce3…

MALICIOUS

PDF

72.2 KB Created: 2021-10-02 13:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c6d415f800260061daa49e03fc38ba8 SHA-1: 37fe21766dabd2210dd00d09ac24daf84a159c2c SHA-256: 8feb474278b52ce3a6393332708dfed9527ae18ccaf69e2fcde0bb7b889c083a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://deleeuwputten.nl/site/data/ws/files/166597189.pdf In PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/65707777555.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109151430058195.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/movarofezeg.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/17659957311.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161581a9a484d9---99207163990.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/45134927295.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/78e10db85904e9fabe537645a3d918f6/87260471190.pdfIn PDF document text
    • http://co-mit.com/uploads/files/kapuz.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/fovoloxapagozu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161533d454b89d---jufisivudikusol.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210926003105.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/vepukazixurarupozujepu.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/46757162757.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/dugativuzetazedo.pdfIn PDF document text
    • https://mauspro.net/upload/files/faxokivaxuteka.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/26681543968.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/sexiluwibufula.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/xekafenivowudanoga.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/75357601871.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/13400572667.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d2c3d94afe0f6711072273be819a728f/gaxudovetukobep.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/melixaditakodufejinetakog.pdfIn PDF document text
    • http://winso.tw/userfiles/file/96731894315.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/pupagigegotofexipiliwoput.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/pubupodaposegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=regression+analysis+machine+learningPDF 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_off0000b69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69B 16872 bytes
SHA-256: 0751b6d6e263119b06321037b6f27e8a87dccb064a6f40903c8b083606d21b6f
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 10740 bytes
SHA-256: e6352cee8254e44dc9cb2a3471fdf3ff6877893a3449e4de3d89b4001fc7a6be

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