Malicious PDF — malware analysis report

Static analysis result for SHA-256 b563b7c2d9bf538d…

MALICIOUS

PDF

87.2 KB Created: 2021-08-03 14:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 135aabb9bff774d119709d8f855a06ef SHA-1: f82b1be4afac600d426786478085867e2d0cebeb SHA-256: b563b7c2d9bf538d257d69f06a315c91ef7cd5895f9813b99025b2ef0e879618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to compromised WordPress sites and potentially malicious content. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious destinations, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/uplcv?utm_term=download+game+beach+buggy+racing+2+mod+unlimited+money PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2857b0f211---kovagogagebazeteginusaxa.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/62307770406.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nr6rmj87g4ttdmtmk1kpgdi3q1/lozugifel.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6k4ea949hjb64dof55nb5fk6p/dezevubapugugilujegoxa.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/mumibegavexevutojamago.pdfIn PDF document text
    • http://thaide.org/userfiles/file/fizuzaga.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/95267783937.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/56951005492.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wugebarixifosikorenula.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/gavadusoredebofaru.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/bd8d6154db4bcb1a7de566178dbb0128/komed.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096ec20167bf---zamibitezalisezixu.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/15151112312.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95fab75096---22207689593.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ocjnn6opv2h7a1621d8ba2no35/diwakobujepa.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///bilabesomupexaxe.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893343481c6---52794384856.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607070a23ec0c---gasomarilofisekusiva.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a90000522---41067242688.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/431ed0b0e376c7b8f29136ef7192f1fa/pokizoxejuvokita.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/69763892674.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a043e99170---birewujez.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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 11208 bytes
SHA-256: c90b3b6bf5dc9b54644075f0b389d9c8fcadc84984c219e876a55a67d8c1d7e0
font_01_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 17452 bytes
SHA-256: 6944abec12d2f3102f45c4f337962cd3473ea1e931b7cd06828c0f732962a23b

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