Malicious PDF — malware analysis report

Static analysis result for SHA-256 873de6a815f29fd6…

MALICIOUS

PDF

98.2 KB Created: 2021-07-05 01:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a49d42d254f86ec87d06cdd28c403297 SHA-1: e7531bcb3d4d9c0caee2582a59d8576d8c52b170 SHA-256: 873de6a815f29fd6a242c79f22b4c55cc8b50720f31a85e03ab8192baa92db69
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/dbf4c45e99909cf5e7edf2fb663caa5e/kiwapikukeket.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52df514bf---72434428326.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/99cb7c6c7ff33a70df7156f5aa89f4e4/91570767341.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608698d577313---sisitiwavejugeje.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/1598748393.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/8080751379.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a2851ce9b---9019925661.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/27q452hqsnvpqh2s10rfh47ka6/nivuzemizitanevufufonot.pdfIn PDF document text
    • http://kalikraft.com/images/file/pukixan.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b173f282b---wutonulapa.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9c2f1cb674279d3880ed73364f6b366b/65391027250.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975821d4aad---vobomesegovidegagiragige.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/14133240704.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/b496df99a48af20c0186681ce81e6d3b/33133598419.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/tosuxixud.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/72652134827.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce1c024d3---kedosovinazajokofizu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/47870761239.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/97291977744.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rjamoclg61tvfudeomrdtrtkaa/42249831836.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c578a0735165e5ad1d8b75c61e6be0d2/50462488678.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/39463060777.pdfIn PDF document text
    • http://kfbi.ru/content/file/rozixowum.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609403e407370---wugowip.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/61823555283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+new+rock+bandsPDF 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_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 10596 bytes
SHA-256: cb512b530c41b586cca59d1bb3636ad7dc334d5053013bbf531634ef97fa568f
font_01_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 17608 bytes
SHA-256: f6664cdcebbb119f3764f744af700cdd8e0df9897e8788167e195e40daf2fc48
font_02_sfnt_off00016399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1