Malicious PDF — malware analysis report

Static analysis result for SHA-256 3764ab673ba130c8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 16:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b9f9ecc28adab700d47739946095fff SHA-1: 64d1628d8ac34e28a5efd2777198a435f441dc81 SHA-256: 3764ab673ba130c8a53608b9a97a3a7bf71cc018ee2f5773724b2b514e626ff6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, likely for phishing or malware distribution. Heuristics indicate it's a link farm on disposable hosting and potentially compromised CMS upload storage. ClamAV detection and ML classification confirm its malicious nature, suggesting it's a phishing or trojan variant.

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://wastran.ru/uplcv?utm_term=tarot+card+pdf+free
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c670b82056---60705551191.pdf
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3220243853.pdf
    • http://pomelieagency.com/userfiles/files/xuxelefirerosumavefolap.pdf
    • http://rovitek.com/userfiles/file/43141995871.pdf
    • http://giasuthanhdat.vn/Images_upload/files/zomiwize.pdf
    • http://hastensandbreakfast.nl/userfiles/file/97273386003.pdf
    • https://mimzyonline.com/userfiles/file/mufonujafepitixu.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b4653d16f---bofesunokizog.pdf
    • http://noospc.ru/SITE/files/editor/file/88197108431.pdf
    • http://familiegravesen.dk/userfiles/file/xasajizibidudemoraxilakiw.pdf
    • http://sungsam.net/userData/board/file/58147883660.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2fbvtovfp3brh834l69heddbth/47483860438.pdf
    • http://2446665a.ru/ckfinder/userfiles/files/bivivomemadakujozox.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcb283c49---dizuka.pdf
    • http://dobre-jaja.com/Upload/file/nagaxasogasapanadoripe.pdf
    • https://ahreco.com/uploads/news_file/denakezevelefuduxozibiri.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wokuwudutenobag.pdf
    • https://legend-chang.com/UserFiles/files/nasul.pdf
    • http://iwilldoit.ru/uploads/files/files/waxegijewefovan.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/55999306150.pdf
    • http://uptownfallschurch.com/uploads/files/gexuvosovazizuzaguraloxi.pdf
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/86815731257.pdf
    • http://96stone.ru/userfiles/file/niviwafodoja.pdf
    • http://gojjang.com/uploads/files/kapidesesi.pdf
    • http://aquaclub.hu/userfiles/file/58238523646.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_off0000b396.bin
01c5716da02302abc9970d014d6db3319c70afa09dc6775960c906bdbaee5daa
pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 10168 bytes
font_01_sfnt_off0000ca75.bin
962caef13bbcbc2890473fddf3148dfb48d761febf0276dd3a8e4a1af39724ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 15040 bytes
font_02_sfnt_off0000f02c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 16792 bytes