Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16b17f8f6926fd6…

MALICIOUS

PDF

85.8 KB Created: 2021-07-14 00:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2336be7fbf86c08cc35aaa9fb1c73278 SHA-1: 299b941431c01c0762ecd5c83832555d56091046 SHA-256: b16b17f8f6926fd6e62828e1a93f22d6af75773b6ee6c76cc5e3499cff0806db
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=off+guard+hyphen
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/813e668d479cdb9100ade115ea5393c9/1268674833.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/67973738875.pdf
    • http://stacjaregeneracja.pl/userfiles/file/14611674374.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73404e2174---97785707258.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a10f21317fc3083377f123488fae9021/mobosovesazatunoluzavob.pdf
    • http://asustainable.com/global/file/34880900479.pdf
    • https://presentkompaniet.com/img/content/file/64699139969.pdf
    • http://goldnumber.info/userfiles/file/rujesosopok.pdf
    • http://akcjonariusz.com/UserFiles/file/71565349869.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3834bb003bf8aa747bd395e447da4dd3/maxixaparimujekefilor.pdf
    • http://dinskayarealty.ru/media/file/xoxevowigin.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765ded450e8---866573152.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9o1ubgh06aq13rsmfsl6g7f10p/99993393216.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a235ee711---97107835686.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe2937e16a---sibivi.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/nudagisud.pdf
    • http://axiomestates.com/userfiles/file/43560154124.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dd07faf7d7a883a082a5c991d6cdffd/dupoxojimusavevenilibopis.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d88f8e28c1b2d582a0eba139a273a6e0/miwuwemoviduradojubig.pdf
    • https://pacie.vn/web/uploads/files/toxetifiwepusefo.pdf
    • https://bem-sa.com/img/file/pusiwiluzubegaxarabopopo.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073279748372---5660955622.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ddebb0219f787c90f7b03bf8ba465079/1620284648.pdf
    • http://calebdobe.com/clients/875189/File/34774197400.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb13.bin
1f138af2aae3278967853373a3cad9f1ca62f5697cebe162e6468be31405dd75
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 18224 bytes
font_01_sfnt_off00011aa4.bin
43f491a56ef7580922f762706407b14a397eb494d8cfb0986f0f4abb541f2367
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 10492 bytes
font_02_sfnt_off0001324a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 16792 bytes