Malicious PDF — malware analysis report

Static analysis result for SHA-256 719224b3f06e6b8a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 09:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34c0ab7db21c98620158cf2f826acfa7 SHA-1: 67154b8b704789fda9c83534782057a4411b46e8 SHA-256: 719224b3f06e6b8a6ddf948968658857fd82eb5ed851e512898b8b46b0fee8f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://canissapiens.com/images/uploads/file/kowov.pdf In PDF document text
    • http://emekyesiltepe.net/images_upload/files/96860622074.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce9f9bf6f---41518637647.pdfIn PDF document text
    • http://remobudostol.pl/pliki/bikuwomibakemipadi.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210929094718.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/69863547133.pdfIn PDF document text
    • http://firegallery.ru/img/upload/70017943682.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/fogiwapimuximasalimovem.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/80280515475.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/kawivuguxebujopogezinufu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/68297d9fabf71d277b230df6621a0331/kugud.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed150fbbc---38871513683.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/pupitujegajopawun.pdfIn PDF document text
    • https://majubesar.net/contents/files/wikigumoxogira.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/96844377011.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/fowilurawokovekis.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/1452316333.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/36596434863.pdfIn PDF document text
    • https://khanikango.in/file/vizagiper.pdfIn PDF document text
    • http://okvin.org/userfiles/file/84562324489.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/fonibo.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/2080971004.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0bb76c9d8a42e0e2d90153899f06cafb/gazezewopijij.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wazixuwulosipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+sites+to+watch+tv+series+freePDF 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_off0000b0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DA 10488 bytes
SHA-256: 7b499e1a9ad65848012478618e8077e7ecd093ae1a806968a1a8e8f0b8ac4126
font_01_sfnt_off0000c8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 16396 bytes
SHA-256: 273c6ad004c7fcaddc2a4c5fa760926bc6097e3d95a94f1d9b0e9e2b5096342c
font_02_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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