Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a539e27f269cf88…

MALICIOUS

PDF

85.3 KB Created: 2021-08-19 12:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e5f436d06feb42751a07717edc8141a SHA-1: 9a19c7f4d4190e63d25e4618f985d76a9e791db7 SHA-256: 8a539e27f269cf88dfead49b66b4b31e4fbe7f9be921c5e327e909cd92585e80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://africa-emergence2019.com/userfiles/file/45925557955.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8650e6c1e---pegelasigimiwum.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840dd897a9a---kalovuf.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/zepevidorilekogerajilu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7e66cc88c8efc364222e5ea9794fb4af/mijovofidelelisukeja.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/62433292690.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/jdq3q5k7rmn1rn0k2bdcd57rj2/27094524073.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/89770126670.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/83212364440.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///84745533021.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7af4469d4c01042b79d2aac898deffdb/fofivefowumibipudipe.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/dalimedekaleva.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/72876336287.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2dbd55a7---31303258883.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e59eda060b66bbcd26aae1cad827b57/wuzezawakenibijomixodu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5b0b8de9894e7088451dd9a1a481de0a/zisurokikawoboz.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0e88a72d59634835011342247334cd36/turevevejexikegizesunabu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/58788098298.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/zemomagokoradulo.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/jiruzegoganufo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/titibigeropofosuzu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e65e819f9af---31478786949.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784e0729c2---fapumefo.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/duxav.pdfIn PDF document text
    • http://climtech.com/files/files/katikef.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb94de424---zavefukoguvekaraderumivom.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/90969023334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=1974+jeep+cj5+service+manual+pdfPDF 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_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 11244 bytes
SHA-256: a5fe1a0820bf58a6bf740d51771500c55ced2fbe789ad2f7d466172de71009a0
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 16648 bytes
SHA-256: 608e34febc633f822161c450e4ca2ff4e45e3fae4b2760e66d9346009b354985
font_02_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1