Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a6d3ffe95b5c99…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 18:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d01b8d205033b7af03d0c6fb9c58addd SHA-1: 0634103c873dcf2e7cc4af31b6ea8daedc6c110b SHA-256: 08a6d3ffe95b5c99caf5b67b107ac5f16d06a77e6499a87bd4f9bd1beaff3114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

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 http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a672aa37502---dozevapunuterebupipa.pdf In PDF document text
    • http://konferencii.org/web/uploads/assets/file/kiretebuwerowoxelev.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5e738dd1---fagukomejosozew.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/96715618746.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/lorisivupotezajer.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/kfta6qc182maka06otp92m3ha7/mawebulagezabumofobud.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c5ab345fc---pawawozaxozobi.pdfIn PDF document text
    • https://allianztc.ro/files/file/fafevibiseputetotugaketo.pdfIn PDF document text
    • http://sin-hua.org/userfiles/91281986620.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/gazefoviruxe.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f1776bbafdabd5685e5e74d67b3d4afa/balimokerelogulebizi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160890a406680c---59881559387.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d507958e4---limivotubonaforasijumax.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5477ef5597f3cbd6875aca52f916e987/44047255134.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d341977dbb---42700782019.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/ripuvukoseputomu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081257d7103c---54673764388.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/kamazimumivog.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/99857301556.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/v5npisjmpo3ehcjojpiiouipmc/96771866918.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/lalubogabu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c0103ca03---kixigujozosagilir.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/26285066595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=maria+and+salsPDF 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_off0000c547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC547 9884 bytes
SHA-256: c81aed4039ddf4fee16162b7fa853912894e211b238b1bb563bde8c1db07a961
font_01_sfnt_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 17496 bytes
SHA-256: 80a8ca105b795986b7a63d00c84a846f9fe75c61f223b3a4693a47dc93c94120

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