Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f251b288666730…

MALICIOUS

PDF

93.5 KB Created: 2021-08-11 02:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40ee1f0fcc3393b195423b3537145b42 SHA-1: bac188053db4f0da02c4356fccf9fc2d9d7c61ef SHA-256: f4f251b288666730e0e76c54c63b24be67ef72548b2547875457d1b9adfb5c90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://chcial.ru/uplcv?utm_term=rapport+de+stage+ecole+maternelle+seconde+assp PDF link annotation
    • http://gotween.com/userfiles/file///64411339690.pdfIn PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/20980955362.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/xumokunijulizel.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/10860402922.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5f375b057ddac6a505ce78112fa3a1e8/3948583283.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/fijijo.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/bijemiduwewetelelazavonuj.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/8ae624d88ef067e8accf4b68f19947b2/nadawerogerozipibojugeju.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/vusugizev.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16250386716754.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/83054579483.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16094016947f10---kixumu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0472a05d710bf13b99bf9eae267077b3/60554575655.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/93212536016.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/24130255649.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7930fd05d28d002099c26a8145bba789/sabaf.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e038af1b---doxipupi.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/7626378231.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/voteviluvamox.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61c787b30---felabasit.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/41a1412eef30372b067df933419deb4d/pumot.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/88ff0d3a9b129d3c1a8d121698aa57e0/43589975628.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/24129243939.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_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 20296 bytes
SHA-256: b9c49a6f4ca6fa97d8f5fcdb24316a164f6f1d03b17bf72254a0773b2109591a
font_01_sfnt_off00013440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 10812 bytes
SHA-256: 0698c6541d1fc4818ad2ad991522f714afc0735e06d0ded355be25c030e6a10f
font_02_sfnt_off00014d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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