Malicious PDF — malware analysis report

Static analysis result for SHA-256 9722b834efb777bc…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 11:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 186846b141cfedc74505659731269bc3 SHA-1: 0e739c1c90042b19c4711f4910bd38a09d1b5a41 SHA-256: 9722b834efb777bc8d3de019a82e23d9ded90b8e2724d1bde3a478fd7d8172af
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 0.9953

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 https://pixomot.ru/uplcv?utm_term=gta+vice+city+mods+for+android PDF link annotation
    • http://viswinkelindex.nl/images/uploads/nekulepakilowinot.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/kupazadotevofekufiwotiw.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/17376034323.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/ruriwabigedob.pdfIn PDF document text
    • http://juha.be/_files/file/866301477.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361ccae2f2a---40913527109.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/momizur.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/72077699110.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/253582r55rne5eeaep3jgbkgu9/35941591284.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134276adc76b---vexigugepitupumusi.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/dasexarubudirul.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/84110986582.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3417380a---newol.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/66056227717.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/kabamaki.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210916_75F785782D11F39A.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/lanelajoxifabodivokobob.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/egpd542kb9dtiv8uq8drbocue1/vetaxageritalufokomujo.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/nugozenifaledogirivufu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/vutil.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/mevamimivuxami.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906225157805274.pdfIn PDF document text
    • http://evola.it/userfiles/files/vetopawofasok.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_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 16788 bytes
SHA-256: 22fbb0b4aae16e21b3ac1fa138be2f2360f316ec4be280455207938cdac6e2ed
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 10808 bytes
SHA-256: b12954883d40623c1a1d2bda4d1f465595f323278c9d0e51b3bfb9c606ef3a3d
font_02_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1