Malicious PDF — malware analysis report

Static analysis result for SHA-256 af75e88197e6fda3…

MALICIOUS

PDF

110.9 KB Created: 2021-07-31 01:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc0f5975b5eac7ac3ac03f2ccf4829be SHA-1: 2684598a01de841a4cd49bb6ed23ca5020431f93 SHA-256: af75e88197e6fda389a51884f0ccb85782c1e3fabe44d5b530ff51e86b1871ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160802e96311c8---lubinafetufuluguloper.pdf In PDF document text
    • http://monkey-do.net/userfiles/file/sazodepusejusosejexel.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/33525124633.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/69693270669.pdfIn PDF document text
    • https://khanikango.in/file/tuwanulasidivusofeboxuf.pdfIn PDF document text
    • http://praguetransfer.com/files/file/wuxulivibubak.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hd75pjc6kc69jpbefa3ocrrhh7/bazezafufuriramariba.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/89704104161.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/gawuzaboma.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/58mq9bdg1nmpkqh15avmuj3u94/suvawulat.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962eb306f1e---36279538749.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd154325a27---pitovufovufolukax.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/wuwovawewagovuwibulemasab.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d6b2b5197---fonupajukifukibisow.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/28316484680.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/68709570636.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e94afa425a7---62175524406.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7afb34c6---pivizodinisibu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///66847514373.pdfIn PDF document text
    • https://digireg.it/upload/dowifopudifusazijal.pdfIn PDF document text
    • http://pronobile.de/catalog/file/sigoburawesunom.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/kumirosuvib.pdfIn PDF document text
    • https://tavio.ru/files/file/88978094189.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/nimapobikuzebabavetikej.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5690dc91967be430b4659cdc44aa3fa2/81700988817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=reference+letter+sample+for+volunteeringPDF 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_off00014a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000162b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B3 11032 bytes
SHA-256: 410f85996fcf2848934a64937b9d4ad7c9bca643c4c6831c1e21801ef22bf21b
font_02_sfnt_off00017c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C6A 18020 bytes
SHA-256: 0e3ee1a9392317326fc72196e1e1af7596ae01475d9e8365e1c10a2ae0b757d3