Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fc23a6b2c2d470…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 11:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c47aff226f207319e3a302747cf0850 SHA-1: d768afd5ed807865a8c89507656706ef3037e309 SHA-256: 62fc23a6b2c2d470df6c560777358edb0f14f8d383c0438783ddf8273f58237a
96 Risk Score

Malware Insights

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

This PDF document contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable or compromised hosting supports this assessment. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://michelschuurmans.nl/images/uploads/file/kupitepoxobovagufetaxokex.pdf In PDF document text
    • http://centralcogtc.com/uploads/file/wowixivobegudopurake.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a569913d---32070057737.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098329af4135---30656927690.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac832a6616f---95422335818.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089e3a2bcb79---zakar.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/mozezalavo.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/79787387477.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/gusunumowebus.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/13534047358.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/20017534541.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/samapuzapusosofujitad.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/37319991350.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/75177478332.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/de0c1b1a915018e49b1cfaab136e07d0/jugikixuvupazakij.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/15440331472.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/100895146160c888a20ec11.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210810080643.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/motutujej.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf293b5ec7a---wufisixalagu.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/xibipaxirogitaninofewafi.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/56172792456.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e054c78dd44---72968581198.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/zapirodizedukaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=discord+channel+icons+listPDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 21024 bytes
SHA-256: 94c26dbf654590a12739f3b31c5c56f6b8f794aaef27a47442fd31ef45244e8d
font_02_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 10468 bytes
SHA-256: 338b8fdb32e58cb531658337fd37dca6d58c1964e58171f8ceaeb65d5f069277

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