Malicious PDF — malware analysis report

Static analysis result for SHA-256 d221611f82db7966…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 09:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69e8e152c28146f66b9fb6c0e7666769 SHA-1: a7cee39f4876e7c6f5f2dbb101e748efc253f523 SHA-256: d221611f82db7966dde45028365a8fab0c9a83c5cf48159e9676f1d4a5fa9118
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=which+is+more+popular+ios+or+android PDF link annotation
    • http://saigondome.com/uploads/userfiles/file/lalegedijozipezobenakigi.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/kuxenidote.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/nofokivew.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/sixavasujutoxa.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/15215762516.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7cc398c5---zobekomaxowibujagozax.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/jonapisidewutamipif.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/pisoxewedaga.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/26611909355.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/81257938656.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/guxelimimadurevawixipa.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/13484365888.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/23793401112.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613443ad06d0b---vagarulilemubawodu.pdfIn PDF document text
    • http://viettruss.com/upload/file/viwixotometebukaxit.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/97879452864.pdfIn PDF document text
    • http://93564497.com/userfiles/fumimogepolotozidozupekos.pdfIn PDF document text
    • http://www.andreapondika.cz/file/18357224509.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7f2b7870d---vimigipenujajemasime.pdfIn PDF document text
    • http://dasbluemchen.com/5493954206.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/20346306006.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/74517818841.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9aed8350---guxol.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/87570038827.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_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 10772 bytes
SHA-256: b7a37f8cb0c8466e98737af4616c30a770684aad71eca7034f87e7b2d81da574
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16932 bytes
SHA-256: 36b44be7c8a51ee7a290984957dfe005e9aacd826d50eba26cebc255a0104984

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