Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b7a50b48e55703…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 17:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c1177623e8ddeef59982bb9a376b5af SHA-1: 6002fc96f12d4ae04cba073702ba6f5a67479b7c SHA-256: b0b7a50b48e55703d29509026e2ee3c6914925fbf36e22303c188e6659b6e03f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=apk+editor+plus+apk PDF link annotation
    • http://csc021.com/userfiles/file/20210908150747_fx45ue.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935191b83b---51374674897.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c513e795c3098d6e87898d8a0b207863/toxuvisovujavovitusini.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/30753024710.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/nomivemoxoxekosimegexed.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/98260148656.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210910122549534.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/8651549650.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/rixutavifij.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wusenomovaz.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7e597500---sixenogipenezewudaforalev.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/givexobaduzuwe.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7932cde7---45530224821.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/896327456.pdfIn PDF document text
    • http://evola.it/userfiles/files/76542674981.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/titutifi.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/nakawufutet.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141bbd825c35---bevijuga.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/63665475552.pdfIn PDF document text
    • http://alvitraders.com/files/30301994488.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614013f6ac0f8---54019955557.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/gojepizunarewuwikem.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/galokusafukujow.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6b9vimr357e6ldnedhhmd7nb14/kevobegimubiwoxukagunikox.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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 20012 bytes
SHA-256: c136546460e0f3a4684779bb203e6a81a9d177c00c13e8d2ad8e4451e4a20eb3
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 10452 bytes
SHA-256: 1f71ef1e61485e45c270661def8730565b003b29e017c795e8b38fffa5a267c3
font_02_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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