Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba4fcb1d13359bf…

MALICIOUS

PDF

98.6 KB Created: 2021-07-31 12:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c84ee25646739909fffe0d689ea20343 SHA-1: 3ba3488b15dc666cbcc215196fcaeb3544d21e0f SHA-256: 4ba4fcb1d13359bfa738a24337c4699c7ed525e241f47f8e8e887e9a64add3ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of distributing malicious content through these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://crewmak.ru/uplcv?utm_term=aviation+entrance+exam+questions+pdf PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fc1e0eea3c35a3b7772c9bdcfd78ccf6/kivefed.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/zipusukejobinudizoxofu.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/sinufagedu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5rqlrl84mfo65mhn1eilui5ov7/21601573337.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/joful.pdfIn PDF document text
    • http://clingac.com/d/files/zudurawawodaredudebeloko.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/xevonirimevupozafisi.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/godokosedoxafabid.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4bd0bc34243a33830dbf97fd569ab0ca/bonodujuzapukirunukepa.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/d0fbcb7c7053ef5d3c57bd0c97b725b3/tugaxu.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/jewonovigajuwike.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd221d35b9---45953334146.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/86464625281.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/venewugawinexujajavivozak.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534d878ea0---reverulegu.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/40772878262.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab06857bfc0---faguxusazigefagipetamaf.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/b0ebc335117f5fe9ffc57921a3394687/21521844196.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79271c820---titabomibomaxuxet.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/24105391482.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcef0b188b---22043432077.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/93d876297fff2a08e7930f816116aa51/zutawelizojam.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/64809060864.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/10355544436.pdfIn PDF document text
    • https://oversaslogistica.it/file/21175935737.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/jijaxuwemavev.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/vubuzaxunikamiges.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_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 11132 bytes
SHA-256: 9f9d7d02eb2458d2e1020af2a2f29066aa766b21d189739c64431be4bfb06092
font_01_sfnt_off00013557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 17864 bytes
SHA-256: eb3d6c85193150c50e109fb656425ad91af98c6f3c32aa8061d396d873a79476
font_02_sfnt_off0001645c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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