Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bee1e63d49704b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 18:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18b7eb445fd99e2aa134977bc8c6de74 SHA-1: 5b12c20901f1c6b810bc699243ced321dd5814a4 SHA-256: 34bee1e63d49704be1d99a03739aeb80d12c8b5f8024a830ddca56a9f8fcf29c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/9296030974.pdf In PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/96892649937.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/48643128874.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/sasalaxozafig.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/59497139147.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/vexosukuwexekibideli.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/43928475238.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/20305087818.pdfIn PDF document text
    • https://avenue102.com/uploads/file/xivepunusidoridusixoraba.pdfIn PDF document text
    • https://businesslife.com/content/file/35548913621.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/89833987495.pdfIn PDF document text
    • http://stonebreaker.at/faniwaxinoregesimeze.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/luredigaberud.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a90e24d7c---xurovep.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/senubokefajavatipas.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/67849622239.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/moxowupuludidigurapozegiz.pdfIn PDF document text
    • http://imbirimbir.ru/files/6147997868.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/60467429635.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa9b51665---wodomupisinogibuluwokuze.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/000e70c4a4767361d1205931285f3a2a/givupekotulibofufi.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fopuwaninuxatesosunar.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/fusejedokovule.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/debuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=prevalence+of+intestinal+parasites+in+nigeria+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_off0000c253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 10864 bytes
SHA-256: 9ba2115f84e013b778864218baf28e160fc7e824c09cd885a147edb6abc87785
font_01_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 16396 bytes
SHA-256: 87d41ce99dc4f919b736a85cd6d5d92ca04cffbab332eb4e3f10f7356a0a547e
font_02_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1