Malicious PDF — malware analysis report

Static analysis result for SHA-256 15226ea4bdf7da0d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 19:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: afe867b0fa57816114ca6ba42a5d3bb1 SHA-1: e322e4b11d10c306e2ecdf223ab8b9f2f3dbcf57 SHA-256: 15226ea4bdf7da0dd9a646e01d0fc0d8b2d7080bf8fe83e9801985d5eb481b7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=orbital+notation+worksheet+answers PDF link annotation
    • http://giftboxvietthuy.com/upload/ck/files/44385869819.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/044de5bf6974584b50f36c17125cac56/27472387630.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7e3235b02522055c49c1a595471110ea/73659452607.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/50855563664.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/sijuwi.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/23770514947.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0f2ccf0e---23991432768.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m8qd0bt6vjt041h2v5u0v7qqt5/tuvezupabanekaz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tdl9m2bnh5r0ae88vt1tr0t8l6/50503536792.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/48560046889.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xareligarugo.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/fobepozekemoj.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd0081ba9---kelaxuvosige.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/febimorokigumix.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/tolubaxalojaxamimudegu.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/kexiruxufogosowibok.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/huaa1t6crg9525g68b31jm56dn/tatunawegidupuboxa.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4suc4dhslfjftrduk0754sg039/36215830181.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c30dfd45412---mizonekuvelimikojosojovu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/vomip.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/zamusomotiposozufe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b07194b5e---8424961279.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/94494927967.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/26845873976.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/zopipipolilowavojejetor.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10548 bytes
SHA-256: 25e06a2561db1801dcfd20098606f9a20fb52997780b3f0c1a5a6688d8be256c
font_02_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 18204 bytes
SHA-256: a2b6808b6a0a24ebb75618acf8dee53e3842982cf2d40308989f449339a856ed

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