Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a599d8482725f3b…

MALICIOUS

PDF

103.7 KB Created: 2021-09-02 15:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d814a03da667e4ee34a7537760cd3bcf SHA-1: 62352673e9b3aa8bd9f4ce417df97ff7fbfe85f1 SHA-256: 4a599d8482725f3b6cb7d495199d8818b9b9f7f17d746bd14bf478c7c3960d6b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. The PDF contains a link farm pointing to potentially compromised WordPress sites, suggesting an attempt to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. No scripts were extracted, but the presence of embedded URLs and the link farm structure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/23c29fad83bd4d43ae6f8e2c2a1b8073/91309284019.pdf In PDF document text
    • http://vtvxm.vn/userfiles/file/84394617607.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/90861223866.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/62213009599.pdfIn PDF document text
    • https://blugarden.eu/file/wagiguzerur.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/belagexepobusazudokifun.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rro9oot0sq9473gtd60esnj0c5/60231767169.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8b80f24a---vutonu.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/viwikafuj.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16295847547061.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/9025724173.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/mozewawoxusajo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0b7c1f484e0f02f2f2715dc5a6e723bb/85670835844.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/69418429484.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/lulamoledozadurozus.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/rimuzilogovok.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef2d69f4c---muvakedadativur.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5cf8143bf40fc1cdee1e626bd81e493b/jewijinexomiberetotawu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079601de07bb---61940757499.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d6aaf707e2c7e47c790e74fbf3608628/82219803403.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pimuduxuvazurugigesudupe.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/46989188899.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/zejumit.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/fojafasivupijisaragu.pdfIn PDF document text
    • http://hibertek.com/image/files/20210627_202525.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/45702593548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=addera+d+bula+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_off00012f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000147ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AB 19596 bytes
SHA-256: 5d8184fd9d63dd3cb9940d3e8c8ad782d9f15b23360b5104885be0636c0ba950
font_02_sfnt_off00017a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A75 10132 bytes
SHA-256: e676aa0eadea153e75e22b25ac9dceedb3056f3734af6e5d605fc819d3fee709

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