Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a1c71fa015cee4…

MALICIOUS

PDF

68.8 KB Created: 2021-09-06 11:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d46b86f7dd5d9e7e9f7e2f6ea962965 SHA-1: 05b7c69e161cfcecd297e7d77ff290a191c003c8 SHA-256: c4a1c71fa015cee4ad185d637ad14b84d1377a665d6453077a71d8162045a9c3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=bootstrap+3+pdf+free+download PDF link annotation
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/taperifili.pdfIn PDF document text
    • https://semut73.com/contents/files/koferugalapi.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/61764144846.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/77750826175.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/40817619560.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df09cb2ca48---nebuzido.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/21109799266.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3d216e7c1c9fdd896052433188b9bd60/bavowuziribusiw.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/dba194ae753eb6d5d77a79ddeadd2123/kovigofanojamot.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/71524495739.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/wepumubakevuzipabosojagov.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/62288975442.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/86b0fd605abf0f31d0f4f44903220e23/94782261273.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/28067150357.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/bazuvinexupof.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd163104bbc---puxomop.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609178405c54f---jojitijowojuji.pdfIn PDF document text
    • http://consade.com/userfiles/file/zukirux.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/9580427752.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/34370115308.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607af41fa2be5---sajetesad.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/25184464315.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/75554910815.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/luvofubukaxesij.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7qku1q8b1he1pi216gstmfgpvb/jofibumuki.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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 14280 bytes
SHA-256: fee3b0574b4268b77f4c0b8745c45876ab0b06987493938121a350ec481af401
font_01_sfnt_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 10712 bytes
SHA-256: 2751520f9c55d9f6fdeb94d9846bc7b5b422ad3b732a861071e589202cf4045f

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