Malicious PDF — malware analysis report

Static analysis result for SHA-256 75db598d992d665c…

MALICIOUS

PDF

79.8 KB Created: 2021-08-21 09:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb8716a976cf44bb96e569f695d3f774 SHA-1: cfefc33993fcad275e1e3ba4a297f8abadab70f0 SHA-256: 75db598d992d665cf4b910623d4e5a8038ebe3a0b8c256d20d28268b3d6f5e4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on compromised websites, likely as part of a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1606398176611ef3fa180f4.pdf In PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/jamugutufelewiwaxikamu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/41797478564.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/70675651939.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/wezawudabiwofamavat.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/26700470971.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc61e8ca5d---2080882225.pdfIn PDF document text
    • http://goref.ru/files/file/dapaw.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0pfkgu27jmmafg8c2oh6k8kkuo/fepazapasemifaxufowoku.pdfIn PDF document text
    • http://minerva-collection.net/files/files/62647885960.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/23450fcc58c04f8b06c4ca084d910b7f/kogeropovisagaxebawos.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/761rne9ok3vechr4pg4t64p1gm/81259944379.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a87677c82d97f31715c0087b1b44285d/79586091931.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pvkm9verufp987unh9ls58pj0p/15531478086.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/11237508019.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/h5pdkv6ovajat1mip71uonop93/fadiwetarafuwe.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/goporivesuvipewamosolemid.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/655ddd8242ed78cea563378f07e132a2/85410869284.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/74fcaf60fa5d59d0681e641a1012c1cd/85720123901.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/nonomiwikinusenanize.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cgk2ui4i4ohahppngr5gsbhgsn/49552256210.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/59849446795.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/334c88ce1d5fbbdeb8a1ce0547f8fcb5/ladoxavoluranetamige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=police+verification+form+pdf+biharPDF 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_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10924 bytes
SHA-256: a6b1c09d86886f0c65e75af0f05f4a69e0e8dcd96814a024c2b81da1ad803355
font_02_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 17076 bytes
SHA-256: fa56fbad061da078be5b9ccccadcc28101a45acb3c0902bfff5641f50b87377b

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