Malicious PDF — malware analysis report

Static analysis result for SHA-256 a501810739de9c16…

MALICIOUS

PDF

109.9 KB Created: 2021-07-01 09:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 819abf3e0a8df777e20377f92146e310 SHA-1: 323aeeba460060e5f3f63d85d5da44aab014ac2c SHA-256: a501810739de9c165cfe3a165e638bed371c6eaebf0ce2ca1c3dbee07efa0a58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1rejq27tj00n35gap3a3jocdrd/9618873131.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081edddc9417---31114373840.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160927672f38cd---mutazarefapekoti.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b9814ae4439a56469a08a69846a3d7f5/zerikusefepupi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3141b47a79fc534e71c03cf0c8889e88/25439069523.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/chsb5n4gt11tan79khthkukvq8/lapijudomelotitamisoxige.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/sigakigokosepog.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/tisajejakafalaz.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/78ef4b60cf3fcedcbcc2e4b84023a460/70093652716.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160950c3b61070---53958144185.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160775dda8ab2a---70420823902.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c034839c937---44430270400.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210526103742227.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072127595215---39523309505.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/67439099726.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd9718a29---99187440002.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940305c94c3---7722672679.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3c989ca6ad7824449f15df04886ffb64/9620297458.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c27157ddb---fojudorakufijeketowizarad.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/20bf8c6c7235bed3277fdc2eae3e57cd/11608178588.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ffs3ko097r4ulmmpa6b0ic9tm/rawurojopiwigowunabi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b9bbdfae---29690238406.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wipakesoxufuvidisedaledo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p1jfnnui90e6013k3lq5rcov92/45601953248.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160786646dd016---bedorur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=west+water+managementPDF 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_off00014b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B91 17904 bytes
SHA-256: c712810c433ff4a56fa18c1748715a82899fe44ce994ab3e146caaba6524bb65
font_01_sfnt_off000179d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000191ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191EA 10272 bytes
SHA-256: 4cec3f5073ad63f7e727bcfaa1fb70c9006bbd918ba86ddb8d5cb60a9436da55

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