Malicious PDF — malware analysis report

Static analysis result for SHA-256 f262198175a3e439…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 22:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c72fa043213379502026c3c5af90e07 SHA-1: 41893f444433f9c1813cf0eab8b0fb62d9cb8764 SHA-256: f262198175a3e4393107bb51c2fefa8a5e1514db2d6fdcd9254a500b866f3e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://eco-building.cz/UserFiles/File/wabeterar.pdf In PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/26634642427.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/pukavibi.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/jewutefok.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe3771789---naxonilo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/65ae14dcc3c61e49fd1611caf0cd5d3a/samikaxatepewomakibu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sedefelefusufob.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///43894983534.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/tafiwapoviko.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/xupawimarevexel.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dfe86fed155f4d40ed345dcf1da8005d/vufikar.pdfIn PDF document text
    • http://kd-council.com/upfile/files/subilumigudosusenuwuguzom.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/zavizufikavuwafeniburu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62233101473.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6fd466300038de9d83e3006f98f504c3/62199646985.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/85244677558.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/14592824971.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/40nqohhvihsedjbbrj7pnqa876/wasulusitafet.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/guvil.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/66475c3b3751320e177c4140264cf9ea/badegu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58172691962.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889c218dde0---57539020415.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tmb31ndeamkjcjj0v1e4bhroo/xugazizurojoxalit.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/didorejukalilapezanokizok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=meaningful+words+that+start+with+sPDF 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_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 18108 bytes
SHA-256: c7ab3e9b9f83a1d335194575bf01d990c72eb825112402997162811c8093ddc3
font_02_sfnt_off00013d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3F 10812 bytes
SHA-256: 806e94b4521ecaf2e5b0762b283d79dcfa8d6095af91fe70ae4a6d7bf1aedc74

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