Malicious PDF — malware analysis report

Static analysis result for SHA-256 133af72ec701911c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 16:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fba5983be8dbd42d6b5d786d4d60ed71 SHA-1: 499e83b2220a067be5a25c3bfa40068183597b80 SHA-256: 133af72ec701911c245b3c477f70f9e91db3b4562a4baea8a7d4fa9b051600ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=sync+music+to+android+windows+media+player PDF link annotation
    • http://machin.kr/userData/board/file/79217142925.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/murufefif.pdfIn PDF document text
    • https://lasanisports.com/files/sifodujazizexitok.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/tovenulusijegis.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nobajikek.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/kekabulana.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/maxorixixubiworimitum.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/46031049805.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/xapavaxomu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd8345bcb---gakafogizorukok.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/60806995539.pdfIn PDF document text
    • http://24cvety.ru/upload/files/55228585976.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5d42645c8470440369cfcac41dbf13b3/64211342577.pdfIn PDF document text
    • http://wirheiraten.de/images/file/16213246241.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/fefotogubuneduwanibepa.pdfIn PDF document text
    • https://tckontrola.hr/files/97118570724.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/fagilinovusafowesorozuz.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tabotabotazudogagebupava.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42c0db39a---giginalofozo.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/95373801500.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/29803517802.pdfIn PDF document text
    • https://matrixx.lu/images/zinir.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/nozujorivasejeboga.pdfIn PDF document text
    • 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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 11048 bytes
SHA-256: 50e217f7d388c082c9b20e62af8202e32f1ddc4f72d0f852d39005916e7730f2
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 17576 bytes
SHA-256: b71a6b016acbeb675f0eba3e11e74972be45c222e250094f99977028b34c88f9
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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