Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3a176ccce5f7cd…

MALICIOUS

PDF

79.8 KB Created: 2021-08-24 15:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a3809a3c09fe855e55e0cddb0cdbdc6 SHA-1: af94db30456287a89f23f0340fa8b2167ece374d SHA-256: 4f3a176ccce5f7cd9919d7e7da472da49abe4e6f42a9423daae4fef04486490e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing attempt, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://china-hold.com/UploadFile/file/20210707083733692.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/lulijubemejibi.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/80155007783.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/wuwazu.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210724122240.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/83982455562.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f90e90b030---81690188457.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/27876903831.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608006c0e79a9---xosinavezawefedelemobev.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/lizapukixikilefoj.pdfIn PDF document text
    • http://airsoft1.ro/files/file/redugugoxife.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6da8e330d7a6e7469c1e674e9a95c876/ladoxovibeke.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b417570e7b6---pasal.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/fanokataruxegizoxo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732139ad0d2---10665424909.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/668734693.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/20659928585.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/42071996543.pdfIn PDF document text
    • https://bauarch.bg/files/lakadafifebufoni.pdfIn PDF document text
    • http://balone.net/_upload/file///30947441347.pdfIn PDF document text
    • http://apvn.info/userfiles/file/xefevijulukasiwugiku.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/dewilubumokokufekodula.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082696403bd4---kubuvexes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sunset+portrait+photography+settingsPDF 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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 10776 bytes
SHA-256: 96fb6582d37a0d93c25c2a0d624c8fda101ad577900da2cd67a7c5390affdf00
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16412 bytes
SHA-256: f6e743220aebf8a73513b823528afdaf98f31cc36c79f1ed8f88b67b0033deaf
font_02_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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