Malicious PDF — malware analysis report

Static analysis result for SHA-256 991d55790eafab0c…

MALICIOUS

PDF

85.5 KB Created: 2021-08-07 02:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb0e82d1c30ba08c56939a16a9aa2295 SHA-1: 1d5fd4321f7937a02bec836494105d821d5b575c SHA-256: 991d55790eafab0c8e82e2979302a28e309acf905e69f2820f0fc2dfb594539a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a URL with a 'utm_term' parameter indicating a download for a .NET Framework update further supports this, as it likely serves as a lure for users seeking software. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=download+microsoft+net+framework+4.5+windows+7+32+bit+offline PDF link annotation
    • http://vallovin.it/userfiles/files/86008920315.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e673861bb---15824727086.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/15150049311.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/62108277031.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/mepebigezivifej.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/ribititozajupabilujad.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/8vl465cf4de6mi031er1m0tg38/bonalejivomuxi.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1f358f4b---topitare.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8485c412d0fd591b68b37a5c7c1f7b11/soguziduxuzufagipo.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/86939553351.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uogdti512gi7p5qd73fdus3uec/zazagigoturekaxal.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/dewegijavera.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zefoziletexaxi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160792d251c4a6---75371105104.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53326524886.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/85487444362.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/gadamiwijebij.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/gubumonokebabelum.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab7605df4---wuluxelegifageroxa.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b778b2bbfa---35449530053.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031aeacee2b---gefalalozoxafita.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/86795624231.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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 17732 bytes
SHA-256: fed2be8db3ab0b06589794b0fc14f3810a4943fe9d749c52734debbfd0fafe6a
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 11576 bytes
SHA-256: 0a24bea7d7bbc7bfdb20d027a0e6fedf45971e15c2358e9f6d78034ee48a2108

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