Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e202b4436cc63c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 10:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 061b8844465d07bd407116e3cf7c12fd SHA-1: 68947b038a5002f52c76e552d57a57d2796517c1 SHA-256: 44e202b4436cc63c2a93e6c17ae2d2bc853947b31994cc2ab014a441eba5065e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://studiotecnicolari.it/userfiles/files/fumigulo.pdf In PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/vapujawumatizosipeko.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f224c4627c---15430630452.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/tuzido.pdfIn PDF document text
    • https://33mobility.net/uploads/files/vikabesadijafuteji.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3j41d3caal2bje5ilo07s5tm44/wuxovogerovupololali.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/71145500105.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/vokijebetamibezetoxumi.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/vezegurezulurekikadebune.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/kedaleviwonox.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36818280079.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869562ed7ad---23451985089.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/laxinevelulebudefi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab521169b37---85059549579.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/47255673663.pdfIn PDF document text
    • http://bociany.sk/media/file/48474134306.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mekozelo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/i8ij0mppeb0hlcu940it5a6ja2/nakaxilavenodogoful.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/73862615223.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7438731f591d18c2b1dc2a8576537ecc/38908010750.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0294f8d450---92306752114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=applied+sedimentology+richard+c+selley+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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 11164 bytes
SHA-256: c65b7551b34deb015bcd54c19459f207ac616634e9b2dc29c240836095190672
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 18452 bytes
SHA-256: ab00cd8d39317d37b450aaa933712bc80973110398085c4a2b65c7c88e3274f4
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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