Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84ae8cfda60186f…

MALICIOUS

PDF

102.6 KB Created: 2021-08-24 00:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 111a365693f106b7a288cdf8793a961a SHA-1: a3d02ab6d70d8318123e193677fdc0856b7a4ed1 SHA-256: e84ae8cfda60186f186c9fbae57edcfe9900cc38572842fc41b57877973167ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://ofitecnic.es/files.ofitecnic/fck_up/file/8604573361.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd71331403---60937775304.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/lepubigaw.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/fenunopi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b98a3a5ae3b9f57051234d6478888aac/51031335349.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e7e93fc38c82ec009b559605c01fd61b/xopawanudawewij.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3e371607c9573a1a55ef4c5a7461a140/34441563314.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/dakote.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/72580192419.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6n0sbis6u3nk9pjqse7khk9i62/voxorijimafidofunenagoze.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/nitofubunutitosube.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a57646098---latinidixefawugajorub.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b979cbfa37---57628629356.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b28ae40e8b6---xujupodelogeti.pdfIn PDF document text
    • http://xycrusher.com/d/files/nagubowun.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16100d14821632---jisimi.pdfIn PDF document text
    • https://kopari.hu/files/file/43044362992.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9ifum7q8lvh032ceparuh0dlt1/62688791285.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/90596051603.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/pinakar.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/guvarufopidekagi.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/retepizuseterurokome.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a363eecd3e3---tapawesafezowujimoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=speech+synthesis+definitionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 17664 bytes
SHA-256: b76ecc128555dc72316951fe0ecf2a6eff4f873def262d94bf2d467bac95439b
font_01_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 18076 bytes
SHA-256: 4c7b3e452e06b73e44d3612484db38efa09acf761e93c9d31a02d79743c2892b
font_02_sfnt_off00015b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B98 10596 bytes
SHA-256: 5eeaaa398dd9242cbe01d8cbd758b421ca0037ffc710dc2dcc1207fc755247bb
font_03_sfnt_off000173c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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