Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9bd36a6ad3df5e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-29 05:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02ee939b7c4e6b87d541f717f672ed3a SHA-1: 4225dd38cbaab9974775004c6c8b0190a7b02857 SHA-256: bb9bd36a6ad3df5e3e7b7cd02a4307e3ddf7d92fbcf1aa315dfaf614e981edb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.florentmaussion.net/userfiles/File/femodobugowerivit.pdf In PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/galave.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/44815264105.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/75543491856.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mj79pi5v7dgtll8unnd02d9se/1570754657.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/13279609230.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/16532780869.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/95baf26c4ab140cc2adc77053eaeb703/zezurujezerekoxe.pdfIn PDF document text
    • https://kameramuzesi.com/upload/files/kiwenonewo.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/xitikikuduxusirer.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff82f12339---jumofonejigozuvemoritagip.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/33382928644.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/karotomamowapefaxag.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/22770216992.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/17039347449.pdfIn PDF document text
    • https://sapporopools.com/contents/files/fimivuko.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/kotenaxebusuzijis.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210917045018_i2vtv8.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/45294418559.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/rodezijiradobuk.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5c5530927baebd9f5b9700bdb435d514/58586990185.pdfIn PDF document text
    • http://staropolski.net/Upload/file/xabufebimogezakuxidiju.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/69202004789.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/32063635501.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fopakidamuwifij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=liderazgo+docente+pdfPDF 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_off0000be6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 18232 bytes
SHA-256: 58e8e67cb65c0760f79557ebd0f4fdc528283b0392271a132afda8a80bfc8eab
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 10600 bytes
SHA-256: cd216e5478e1a3db44216d3e551a8b6d70fdc691c3be5a70971c3753adec12f2
font_02_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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