Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e28cc0d5b1dfd7…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 21:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6da240e844ba52e2646d96ab96be3bb SHA-1: 39d091692cf938179429a0ddd727edfe4ea6860a SHA-256: a7e28cc0d5b1dfd7557bd3f25579eafa4c093703af5448e3814d72823fff7299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=traditional+mermaid+tattoo+meaning
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/xiraxo.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/40709c00368b9f34f4c83ff02aefef1f/26240854802.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/73d48f50dc10cabeb4102c3b0d8aba97/tanijukikozupike.pdf
    • http://belst.by/upload/file/49670917207.pdf
    • http://albino-pitti.com/pub_img/file/xevopozodaligukumiwipezo.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160903eaa809ea---64450370739.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16090308a8b678---zelorukezarune.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0227f7aa60aff97b09933eb3043e9e30/somage.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f6473289---riforabukovo.pdf
    • http://cuahuyhoang.com/media/ftp/file/dotasuxotedemedej.pdf
    • http://kirakuramenandsushi.com/uploads/files/nevizizi.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/92924164493.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba63cf0ec37---xokif.pdf
    • https://publicbridge.pl/userfiles/file/jawadatonukidezipa.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fdee431985480129aec5b9e92429b03b/61914663108.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094442be0adc---68232194949.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/ratomibuzetixiwe.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/07d504ee85cd4f5dd74f4efad90077cd/fajizegezazusivojodetawov.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440d082f6c---40426997231.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/9da8116668d0a3735fede413fc1490d9/67565074830.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c97e9143---75551356154.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rhvt0tpu34u09tm1tghjd0me52/28014802020.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_off0000e89b.bin
6a9b22af89f99f379bb1c0bf03bfb02912de580e36f8fad64976e7a9916fe28e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 16748 bytes
font_01_sfnt_off00011434.bin
18fc5ecc04ee8c4fe6a51bffd9229eb440b856efadd838604d189ca01d1031f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 10388 bytes
font_02_sfnt_off00012b6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 16792 bytes