Malicious PDF — malware analysis report

Static analysis result for SHA-256 682c22878f0eb91b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 07:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d551add70d935b26f76ef6f83749e5e SHA-1: d2940d36c1e95e978ea298f2a515e63226831204 SHA-256: 682c22878f0eb91bb96e85ede2517107d8766776e5b4ead847d97a7567f831e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/efee969cadcdfe26205ffa7dc413e76b/dawepuripalasava.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6aed455e---binalaz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7f887d7c62c5d35a1ca7a4b2c41f4b5b/12670701303.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/rasevevarasasibajejivef.pdfIn PDF document text
    • http://scpt.it/userfiles/files/joxutabivowar.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/tanixojevijegapo.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jugevunelupegeguramiguli.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/dqf4jgpqkh9kgp81nqd7gcvi4m/78707378756.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/bobepisifezifop.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/83050846112.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74885000040.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/bugireka.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/rimogukebugamepikemu.pdfIn PDF document text
    • https://bamor.org/userfiles/file/detakarifones.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/watavobijuguwilusozurup.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/067af70932d5fdc4db9ea2e0b60761b7/rovijigevas.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/67187081032.pdfIn PDF document text
    • https://blokhol.com/upload/files/zulikijetek.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/todubitofomudode.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbtgom0a1sd36v0nbe0jgleh5f/rijejem.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec34682433---paxonevatavosone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=atoms+for+peace+speech+pdfPDF 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 10624 bytes
SHA-256: 8cda14b4c18ebdb33fbf2b1f25a6c68cda2436da9e7b4059246be87bda2ba95c
font_02_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 18448 bytes
SHA-256: b84c018e1598904b39ed7604dc40c65273657d345527ab5e52cb24bea15148c2

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