Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1b210f73e7f261…

MALICIOUS

PDF

72.8 KB Created: 2021-10-05 01:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dcdbdc8353717eb58c029b6288a4b7ae SHA-1: 63ce8f5a8eb8de8848e2715d0b307e2c3ce1d92a SHA-256: 7e1b210f73e7f261eaa0262057fb3df57c475c46d2608250b2efeb8c9ef73071
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=pdf+2+pages+in+1 PDF link annotation
    • http://orderbestwings.com/uploads/files/82433578565.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/xuzudefususabuwepaguta.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314c6b1f927---61359520289.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/70208552778.pdfIn PDF document text
    • http://nessium.net/userfiles/file/51442214461.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156104cec5ee---popiti.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/95697666095.pdfIn PDF document text
    • https://cargobull.cz/res/file/nugemeb.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/wogubupelaf.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/wixulados.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/sepeluzorevifawa.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/bokozuwefavasa.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/63852840232.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/tubowevawobova.pdfIn PDF document text
    • http://linker-apps.com/files/vogepidazimunizafa.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210907_201627_148.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/1074843012.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/paforupotowobenu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/23853318919.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1615ab73d46356---perezalimunabi.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210919114711162.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/88935133896.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/26660547820.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/61794205094.pdfIn PDF document text
    • http://prograsifkalip.com/files/denaxux.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_off0000bc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC39 10484 bytes
SHA-256: ea7993777e518ab1897443a6fc12840e9200e0693a3de29d60a55ece01626a06
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 16300 bytes
SHA-256: 638299f1110fc585101cb56f872aa62e11b2d2cb76aa3d832ac10aa1864795c3
font_02_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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