Malicious PDF — malware analysis report

Static analysis result for SHA-256 2494ce3251141f69…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 19:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a69c91e390525ca3419fe2d178757c10 SHA-1: bb8d28ba9ea1784db1bb1a082ff58ea762edd15b SHA-256: 2494ce3251141f6959b5b898291cb6dc5b1fe794e0f3a236b150208c86f1bc50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oilandgaswork.com/userfiles/file/bopivipovivur.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01b1e7215---wuvefomobozamozusunotan.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f802bcb63f6---55368150462.pdfIn PDF document text
    • http://hkacca.com/userfiles/30223562679.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609443d6d9856---zoronalamo.pdfIn PDF document text
    • http://gtshotel.it/images/file/56647963508.pdfIn PDF document text
    • https://camphacement.vn/upload/files/19358117446.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/wivabedetowes.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/sutabusir.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/pizekajukexoragaj.pdfIn PDF document text
    • https://codecs.ro/images/file/dokopidab.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/814ee9050d92fe4b040ba5849b8bc277/fidoketag.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/h9rp6i4acjp8scmqh9u8ngned1/57469092948.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116331a219e4---7822677484.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210802_075432.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/a12mejiiiso7k69nl01ctpne3s/wevoluda.pdfIn PDF document text
    • https://pmms-online.com/assets/file/bosesa.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/3628003608.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610563bb0f29b---35445903626.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/61875052675.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93a653586---38323192004.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lowilaso.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/91679472131.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/siledosi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a1c9648e2db9dd296026bf59a51dbf50/74291862861.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xosevapinowe.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7kbmt3t61l6797t06f2424aj4r/surop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+first+national+parkPDF 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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 10512 bytes
SHA-256: 46c639c373b1e5f1f25e81d371a8e756b8f9822d43468bbdbd9c186e006b61ea
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 19040 bytes
SHA-256: 5eca9a915a64255ca72b7aad74902c64ae3345288b12867a6a8ebeb16a21b194
font_02_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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