Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4af75b1587b1010…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 14:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84e1be83f3f28471d8a9720b998e4ee2 SHA-1: f5e61e370628bc11ddf69baf1b25c934ee5c427b SHA-256: b4af75b1587b101044bc49de1e5d412989991ca2dadb6b0d299c2bf60fa2cebd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream, which is a common technique for executing malicious code. The file also features a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.bankkartya.hu/js/ckfinder/userfiles/files/47422775252.pdf In PDF document text
    • http://mybyblos.com/userfiles/file/kesugurifurifati.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/kipalatinunubebukuf.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/88430085441.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a0b4550bc2fa7c53b3806fa6573b4af6/libagizegaze.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c67979e83e1c0c8dd5a0185a0541db5e/mebawusepiduwujogosifo.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nabejizozijafobe.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee59e85095---42267903070.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/jagelasuboledowuzove.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/61003130763.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/19079730662.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/c36i0ak400814c4n7qehi46n5u/58622160373.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/moxidenepoganewuzesa.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090320365683.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/56036905210.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/parurazawebega.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/34430361812.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/41072558924.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/2831537729.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/17705617351.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/mifubum.pdfIn PDF document text
    • https://bliznacite.com/files/mofunezutanajufabodaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=moto+one+fusion+plus+android+11+updatePDF 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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 18888 bytes
SHA-256: 975201fcc01a0e7b64d7caf8598e9e9fe5cb2c62f1df8b8eb767308b55a06929
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 10636 bytes
SHA-256: 50223d066a36f8c11a00887987cbd2b472781bb61e88b06b3d59f5ec067ea237

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