Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b94cf9829d2f07…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 13:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 021b05ec322ba0d023fa91ce181b281f SHA-1: fe5276cbc815b70dcdb9f43c70f2b65c7bf426e4 SHA-256: c6b94cf9829d2f07ce00adb9ac5487fde0c33afd8b5a5dcb04e40469bcfa8c86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dufomirokipamejanog.pdf In PDF document text
    • http://motoren-adachi.com/js/upload/files/dimiwomixudevuzekewu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6a9a8eb19---gemalunopiwirusuf.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ac551cd4646b9a82f66b6843a85e8918/wederaxuvivikugej.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/m11jdurkd2q9ch14ahe706cnr5/nonowimutinukopezogukeji.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/xelixusenivunaju.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609289b533214---geviteveset.pdfIn PDF document text
    • http://spiregene.com/image/files/20210715_194244.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9d4b732c9---4495173198.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/pazajiroxu.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/57753640114.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f78ef2fe385c0707df33e5d9353edeb9/42745754908.pdfIn PDF document text
    • http://rcot.by/pics/files/vikimugipuloxeluj.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609026cade35f---foxifizu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dm9cl22nrh8s7voki0837l3s92/kiganot.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093d30d94cfd---83605463483.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/60841724962.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/095980afc160d18793021fd89403d887/25544174170.pdfIn PDF document text
    • http://snft.ro/media/file/72926588863.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6fe92653777c37490ee90b7f16e2f5bf/tobuxukazijibos.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/bupenanodis.pdfIn PDF document text
    • http://grabnerestriche.at/kuxesogadavoxutu.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/19318514798.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/16855008943.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23b7be2a1---53841567038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lsat+secrets+study+guide+pdfPDF 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_off0000c4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 10696 bytes
SHA-256: 9841ce76b888f1431e69a63592cbaaec070ca9ba5b35c4aba3ca1570493fc88a
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 17028 bytes
SHA-256: 0641e3ca4cb282ef39624d4a6e611cb80e2663d2ea79b9961faa6aeb2d2dab9d
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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