Malicious PDF — malware analysis report

Static analysis result for SHA-256 2988cea53f6a0d01…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 21:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c0f49253ddcf91d300ced6818f7828f SHA-1: 75c1ea6961522b0ad59a6465b623c9df0dbf5670 SHA-256: 2988cea53f6a0d014c708a65ca55103ade6783fb30fb90429c1cdb26901ec3ac
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and multiple external links, several of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://gppacdatabase.net/userfiles/file/goluwuvobikibotorun.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e816f208a---mamara.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/limokowawufonevivi.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/jujafodes.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/11/file/rilobuxarifojiwi.pdfIn PDF document text
    • http://hybsch.it/upload/file/60054497113.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/pegeval.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/15354402322.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/90102139020.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/memumuxetolujos.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/nanufurozuvutaxodegazejin.pdfIn PDF document text
    • http://airmon.hu/images/files/pejodi.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/bokemoto.pdfIn PDF document text
    • https://bselink.com/userfiles/file/9963504408.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/30251934791.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109021204226529.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/94777520978.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/86396734264.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/94783993609.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/54bda8cb3d6287ce508b78288812d8d3/nupafujo.pdfIn PDF document text
    • http://ombs.ru/uploads/files/parop.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r1h6lgsr2ui4sa329nk3mi7d39/pevebimanivubis.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/42636810977.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/69816039380.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/43117772887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+send+stuff+from+your+phone+to+your+computerPDF 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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 17888 bytes
SHA-256: 4ca78fc2f5e203bdf83f4ded566bdcae2e58a770fe306735daf90933e870dc24
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 10876 bytes
SHA-256: 18a242fe712d0bdb5c74355a5b70875e53e738f82fbfa33e89b4e104f5836166

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