Malicious PDF — malware analysis report

Static analysis result for SHA-256 483a93cddaa990b6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 01:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3c8a044594781b3f65d2c860ec41597 SHA-1: fcdb18db16b24ab47cf6d870f939698a5eaa948b SHA-256: 483a93cddaa990b6bee2093252af3d4c23b68725a11b61f158dd775987cd8a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=2021+vpn+apk PDF link annotation
    • https://jajugroup.com/ckfinder/userfiles/files/zarewokaxupibenawubekabof.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/6408368594.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/juwafuvijilun.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/makafixixafika.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/lagerilimisevepojazofu.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/mulepifuvinelosisise.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/zonivuzexef.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/vakiwaju.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/nilolitilatulit.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/jinokefi.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/livikisozabijutizivanoti.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/15734260169.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/dutumobobagedi.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/fizinotofixisivim.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/82000546443.pdfIn PDF document text
    • https://susta.vn/userfiles/file/meripisabapivopubigepirux.pdfIn PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/88282194095.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a89d0120b5c9ba1dbe61487990540a3c/jatosenorunomo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af77d33f6a---jakuturedifivediza.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/8176950562.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/bifonoxafurer.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2ec7efde45a52b2c3c26fd75e5f3dc77/wojezuxutofu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d357a476c0---13686495145.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6fd81ceb---15513413042.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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16784 bytes
SHA-256: 9aa8be7efb8050fddc837c113658a88b0d9733f1c94b31b5cfe7fcad49a04b51
font_02_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 9844 bytes
SHA-256: 9c73f3847384ce249de6aff667681107d79fb0389cc3c8ea599c0aebce055564

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