Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfc68f491c9008d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 12:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c910e2a145d617299c63ed8089341fb9 SHA-1: 948cecfcbf131da101232ed06dbd86cb48d1bc46 SHA-256: ecfc68f491c9008d7eb609262ae02541ef4920352f0a1b08db71bcae22a58ba9
156 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 disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://veterinarycarefoundation.org/userfiles/file/16898721073.pdf In PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/51076475822.pdfIn PDF document text
    • https://efnnma.org/files/file/muwakinisiluzivunob.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/duwubexuzidodaforulaj.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/wujufabutufuxetazadeku.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/45477057280.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/76825234306.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/8858722881.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-08/images/files/60783936381.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbcf5555f9---74235678692.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdf11e2ea---ponasuzugi.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/tewola.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160865ba16c24d---48909499383.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miwolomoren.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su552mfr7fr80sf4thdh3ugpkf/nojone.pdfIn PDF document text
    • http://getem.pl/files/file/19179654593.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f338a7c5e7---lizuk.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d4233d25---80539263103.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094228bc4d9e---42873407133.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d381677eabd---30575174266.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/72939745478.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/baxurizetekifunone.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e8b652730---zaxafevaze.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/33f9f0fb58448daa0889cf262ff8174d/mejarapiwojisita.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a398a5a8410---1284863618.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707942296a---60786418728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=literatura+policial+brasileira+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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10704 bytes
SHA-256: 4c71cafa82fd667e3deeeacbb370a71a20b77491782f6d77b78f2d70adf67fa5
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 18252 bytes
SHA-256: 78907d7cb63de95cc8cb1f67a4621efc5830123fc22d1e5889160e75cdbad329
font_02_sfnt_off0001369e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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