Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb91156017f92c30…

MALICIOUS

PDF

80.1 KB Created: 2021-08-26 05:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 13ba786f8fe9cde6eb6337d814a7b85d SHA-1: 09652c17cbfe0b98d5b5eed297a962a83cceca1c SHA-256: eb91156017f92c30e15ee06933f2fdeb3a9a6c7179f71796d52e620db901ca94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs suggest a link farm designed to redirect users to potentially malicious sites, possibly for phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=how+to+calculate+number+of+proton+neutron+and+electron PDF link annotation
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/62332621586.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kl5cvh5britr0rruucoqs6kosm/27455828751.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/39055042204.pdfIn PDF document text
    • http://lyshiying.com/d/files/34738669133.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/83547802050.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/wanux.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/dsv64rbcb4129gbj0hh41t7jp9/31735237522.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/33241772648.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/ketazidunigudozuxixotubi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/utkumqlvokitt867hoegvp8tr2/97944150418.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/vevopimakib.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427030d440---19893005915.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jumurufoberisewax.pdfIn PDF document text
    • https://fivetc.net/uploads/files/6306212061.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rj8j12188q8cgcinaao4o2c55d/18169521469.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/60716021435.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b8929ebe8a56fc0c3d34fb9f7fa7a9ed/36972565839.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608861b89b824---52987166888.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160770e9774e5d---56701491340.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/17360713363.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/6179972543.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c669006a9f---zujalusulupolesomomodure.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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 16420 bytes
SHA-256: ba795f94db829300298566f918e6d2fe6b9f25f3543f3e92fc9d029495203662
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 10840 bytes
SHA-256: 66273010177305556d83b826b652b067dfdc320b37643ab0889e043da9c6519f

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