Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5e5980b37bfc2b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 21:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6ced9721062d0ea396fd743eae35ca6 SHA-1: 29825b83f95c4e74b0343199b395033e0588db2d SHA-256: bf5e5980b37bfc2b2742a965f976300e513d820f980a012987f6b50aefae695a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ufnk.fr/app/webroot/files/file/32812099131.pdf In PDF document text
    • http://ipceurope.com/assets/file/bapiru.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/piwadibu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/77ca195454e6f6b608b9d87442d52aa2/48398179259.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc79443dfa2---nakumonemogar.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d1dd8ac9---lijit.pdfIn PDF document text
    • http://sparkpro.lv/content/file/ripadamitagigubed.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/jakujirofiwosesewowadeg.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/3i0vpk7cr50ntgq38ivm1tvjt0/videnusakoso.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/47780543832.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_233734.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/zijetefisepatugumoxu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb744a3cae---42870007366.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/foxadozufimodonipenolodov.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/fawomisatiduwev.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4dfd5ee80---85340963972.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pizoruwawaxu.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/57070798827.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b47ac49af46be7ce88281a5d3a27748a/pelinej.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gadenefemupapexuripipez.pdfIn PDF document text
    • https://latework.cz/soubory/47895299048.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdad26e93a---57027643102.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8c3d93e3b94e91ff40d77f9611b22477/siwikoj.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f5f1af3f351b25c70d63ae9c7a075f7a/niwapifofewifa.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ed16238d4f167274c66ea535de876398/11166193165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=why+do+crickets+make+soundsPDF 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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 16200 bytes
SHA-256: ce55fc5d2d4e39d2c4771205dd7a2dd9d0f63a20fa7006a564b5422f206e46ca
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 10888 bytes
SHA-256: 3080012c54e669c3970497c0f933f363c015934babe5f7ae7dca89f8549c0d64
font_02_sfnt_off00011be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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