Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df6c0e4d71d839d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 19:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98bb91a3200fd696aa3efee429026f09 SHA-1: 54216e2eeaa1a970f9d6a5d9edbcc807e75c6d1d SHA-256: 0df6c0e4d71d839df0e93ff2715b1f2e2199c09f9aac67d2f703ecd3174c9de4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. These links appear to be part of a link farm designed to redirect users to download malicious files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=fake+imei+ff+apk+free+fire PDF link annotation
    • https://comfort8889.com/upload/files/38215140351.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/bizefiviwenejefapajamoso.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/72465498803.pdfIn PDF document text
    • http://ssp.by/var/upload/88067922756.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/nopubepavenafufexenade.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/sunabomudenupevotukiz.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/zalizuxepolawexadezire.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/febufulozunibubepo.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/gifojutokusaz.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/levuzapawafixijad.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15972753000.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347cd6b70be---sipatafipuzivawawazawoga.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/79395661512.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/lawekuziviz.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/salav.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d46129ed8cdfbb0d0017cddef5700643/12729742915.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9601b08b2---56618244099.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210912203304.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/womadadimerugisovipixux.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xofupakegilodutet.pdfIn PDF document text
    • http://modern-pro.ru/files/file/40154332618.pdfIn PDF document text
    • http://makaroma.fr/upload/file/25531063569.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff2ad9a85---zifirabitakitofu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304368d34fc---jetojaredomag.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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 10052 bytes
SHA-256: c72d2c641c229a1b979fc9fa8451710606c6b2caf949fdfd2f43d01223cf5692
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 17628 bytes
SHA-256: 35a104862697b3f9fe5e8e2fabed77a6ab01d69b987bfdf227bbeafdec362923
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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