Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ea1a829d744f06…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 22:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3e9e748fbdf0aff17c7e605f52a04a12 SHA-1: ac540accacb3e90b04c2267764c97d3a1bd290df SHA-256: 08ea1a829d744f065e5e4dc17e70405392072e4c81fbc78ebd4f731fd2c6441b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uot1gesnv1ogp3lc17fnfe6pks/beropifamaw.pdf In PDF document text
    • https://coluer.ir/documents/file/datuwelevakobomo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9f19e31332762dfcc06f7280e1203c1b/samisuxolilopidabok.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/mitakuvukebaruwugovu.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/91349404863.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kgpamctk11ju2btuncvc0l8jb7/50944992356.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e58b4ac259061f5f17d3c65912aec04a/jaxajibuda.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/sabavamasuvidotepanol.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611bdea67f8fa---88394879185.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pomalozuwazixu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882659391c8---fawumoxidopodolejogi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/pipuwefozufovibigifa.pdfIn PDF document text
    • http://kelsenator.com/userimages/35402731764.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vosukubujurarusizudori.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b30c877a7b1b4c4e5bbda6d082a56b5d/toguwodinesumo.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/wulexidekero.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/51359270122.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/29471020817.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/65557730561.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a48327a2dd23bfb033ecc5657277cdda/belod.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/8494955683.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/dikojifipalivot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lawyer+inheritance+format+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_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 16984 bytes
SHA-256: 5ff377d4ca8d2f2273a95e8f64135633566fd672fcd37cd612616f07f12aacbc
font_02_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 10828 bytes
SHA-256: c98ef32059fa0ea6073edd41b1460518ffb13a6a58224455ad71e109d5087f14

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