Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d58bc305ff0be5a…

MALICIOUS

PDF

109.0 KB Created: 2021-06-27 01:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0ab39095ba0264bde5eca5c641f99dbc SHA-1: f16b3e318bc5839da45b09b567fcea168af2f81b SHA-256: 4d58bc305ff0be5a12df313b6b54ba5d53ae229877c59ccda60456037c7f89a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sportsht.com/userfiles/file/42130338877.pdf In PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/pudumu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0ab41f99---78218072310.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kunagap.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac25b2eb3---vikabamevuri.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/26747516037.pdfIn PDF document text
    • http://cymagun.com/userfiles/ziropexamejudagujeroj.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/74663665272.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/12c21c4366c5864d68925621737dea86/51721178179.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f49b8b63e---bibonelimirexaxelo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5910e7d86---vilelusitefowom.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/batadex.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bcd183b1d---9732973667.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c6e5cf6c2735c399c6ae5aa671ee1b59/kemavoreguseranu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9033e45tn0um686p7h5r97u1eu/mipalosorumemitule.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/619cc6096477fe5def39c22491267cb5/47099102243.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726e37c641---37433778921.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690d1639e7---90931650210.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/65840374741.pdfIn PDF document text
    • https://triosms.com/userfiles/file/tunanigomuxegu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf1b33f41---15696701330.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/gedinapawefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+carter+2+full+album+free+downloadPDF 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_off00014347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14347 10888 bytes
SHA-256: f19a2e9d5787ea92a592d9c4281b7dbb5d95f5a30937c463ef8db1af6633583f
font_01_sfnt_off00015c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6C 18712 bytes
SHA-256: b2d96f93717a92b899d6cf7a58d64d0c62a8d0f7e4f581889ea61111140149b6
font_02_sfnt_off00018d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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