Malicious PDF — malware analysis report

Static analysis result for SHA-256 8151098d25c816ca…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 20:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 945cd551115ba901d0a034f3567b510c SHA-1: 928b0bd1ccc23612b2dfbb6fe3d7bdf9cc1f7277 SHA-256: 8151098d25c816caf61bc857d0d24da66b33ed3e763abc5f0330ca00fa9fe70a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate that the PDF links to compromised WordPress upload storage and is part of a link farm on disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e5b34a44---9262303171.pdf In PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/7052298057.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ae51fa3b---jakijelakibagazegoruz.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/duwekunakusodurugapob.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/virixudigijesufef.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109102034407402.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/zavapara.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/wenizisefesadufupav.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/87071743494.pdfIn PDF document text
    • http://rts-3.ru/upload/files/72456326133.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/75888048886.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/luxomikepoluv.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/59664583599.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/78652437649.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/manugudazuwutug.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/lubasakuworo.pdfIn PDF document text
    • http://vce34.ru/attachments/file/domikuxuzatobasebulepiwum.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/95385365492.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/popapesobimomudepupid.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xafevupewazufu.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/nalixino.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/difan.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9d2319d6151eaa5f77a9b07dba56cd36/23037018901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+video+production+appsPDF 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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 10608 bytes
SHA-256: fa6f530430065ecefe6a38343dd39559ef29b402346811d4bc9a37b61f51e6cb
font_01_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 17280 bytes
SHA-256: 632b43ce6211d8c617757819193afdb366bdf3f1d2ce1299389a5d02dfe7390e
font_02_sfnt_off00012ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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