Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e5d98a10b993e0…

MALICIOUS

PDF

81.3 KB Created: 2021-07-21 03:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b155715bf75c12fbaf1259f17a3af63 SHA-1: 08a6a891628868b2aba233956dc3a568151bcfa4 SHA-256: 81e5d98a10b993e018ad8202a74a10a31dc4418b371ed6e4c0ea0578840dc837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attack. The presence of external URIs and the classification as 'Pdf.Phishing.Trojan' strongly suggest the document is designed to redirect users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebf1a45cf---52023801332.pdf In PDF document text
    • http://mxagproducts.com/upload/browse/file/fizamenetivovarubor.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797de660278---kexezolim.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b12fd92ca235da305a26591035679dbe/pitagesar.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/xanukezez.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/754405ba9c890a01c8ce2bcfb9101306/nunusa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f0aaf1b997c375297fa9fa47502bc32e/ziwaguvivawupotojo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/dkit7s8k94n6sdueommpln077p/1277883171.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/fusaxobevituxatumotorid.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d15b94c194dd69f504a9577f783b9cdc/86971461416.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7e5c3346---72740853281.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/62854884497.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7171b40f3---81581972560.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jarisaluka.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/josimavunifepetodes.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e256cac34e---84465050485.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d8ee8b07---23453754425.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8cb608b3eeda07a05449c632e885d6a6/satuvexisa.pdfIn PDF document text
    • http://ciskmv.com/css/file/78757439775.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/11699086167.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/96583217066.pdfIn PDF document text
    • https://fallsplat.se/file/25405065639.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160793eb0a3ad7---94969000476.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/13299918552.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/nemigetazidozulumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+willy+escape+from+pirate%27s+covePDF 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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 10812 bytes
SHA-256: 2a0e6f5dec0f5ab3417e73e5f5e081ee9cf4951933d27af2fe313e8c1f7da424
font_02_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 16896 bytes
SHA-256: 8dbe03389b8addf5eb185c4024a563eda5810bc29a6391e64a3dfa614c0bf3f1

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