Malicious PDF — malware analysis report

Static analysis result for SHA-256 20392b3f954b570c…

MALICIOUS

PDF

89.8 KB Created: 2021-07-22 18:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 798087d940ad88a4bd02a40b76e1b4e0 SHA-1: 6960b4dbb06dd5ff74ff0fc7316f48c62ad78bc9 SHA-256: 20392b3f954b570c77d8159c884452d63307cdd4f3fe5b29ffca8b1959f4f874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://theshippyfamily.com/clients/57051/File/48905118863.pdf In PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/9cabc18be1d6c98b54183ddcedb90acf/49305664685.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bdea9cd2d---zoxeropajadixunexepofafel.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/46315478560.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0840ab2a2cef76fd726a8a24dc6e26e0/887166724.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/zusiv.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210613082342142.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/tazibobeletupapirebubap.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f780b9e7---losalekodise.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/32509793.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/c3479d08411250b34bffc715cd7d0a84/36917570562.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609218cedb28a---9905750094.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/39479945750.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc6543f214---zusidosuw.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/8tau33ek7g7glev0n189q230tv/13825010827.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16223fdddbb375c93c515507517bbfc4/2844328966.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/40f85ec3ce633693f1013c03fe688666/rokudaredikejududaniwulu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89f2e8bdb---witarojevifufowan.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c86f215fc---fubipudinab.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/3acddf76e5a1b70105814ac791aaea6f/tovitafamexumori.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/50059743732.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a34ba8dd---riserifarupegozaraboxoxem.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/fuvagamuwamuwizif.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e6d0f76a---lopawabuje.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0c2526cd22859ca46688413f3d08c4c0/tibobemolizido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=can+meat+be+refrozenPDF 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_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 16936 bytes
SHA-256: c70d94df8ea6433cb0a349252d807c8d98bb6a47de85062e80be57c303e22e03
font_01_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14153 10300 bytes
SHA-256: f88650adda458235ab51aabb2be5e9b1de5c20ce5333b6bda5a5f38b059fd885

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