Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7be7498b920073…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 09:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa735c13eb7ce10f04d83d2de973d78b SHA-1: 9e8a4abb2128caec6118f8494b5f6d1a94032dd9 SHA-256: be7be7498b9200732c8cef7054714334572690461fb5ae37fa3ab1e7abf119f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting domains, suggesting a phishing or malware distribution scheme. The presence of multiple links to potentially compromised sites indicates a broad attempt to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://indicaperu.com/userfiles/file/luriwopaputo.pdf In PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/91466207479.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/zapivog.pdfIn PDF document text
    • http://www.agot.pl/upload/file/11840431072.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/50472040549.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4ee9bdab---38349823305.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/5889878509.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/74506813476.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e5373d1---33407842981.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/60271491751.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qgmmb519llchk3lg2g54folngr/35113009410.pdfIn PDF document text
    • https://limsurempat.com/contents/files/pupag.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/62610581925.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62536194253.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/kofovida.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/23650900588.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/sanegevutosemu.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914122052.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/neb44puu7h3thlirdml2e8gmv5/67770800935.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fe9c203da32720aa015f44349c28ed6a/22011009826.pdfIn PDF document text
    • http://erpos.sk/data/files/wezekiminu.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/38401650711.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2232b1fa---42838967488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+market+contact+numberPDF 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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 17744 bytes
SHA-256: 5b334965fdcf0c4642301b90fef98bcacceeda859dd7018cf6eac3b46809b7fb
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 10632 bytes
SHA-256: 2d22bbcbcadeea00536a393a3cab528b85f82a72f614677ccd725d59a698ad13

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