Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a99c6780ba991f9…

MALICIOUS

PDF

86.5 KB Created: 2021-09-11 06:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e18a91a7f7847e624577cd0fd26cf53 SHA-1: 2fa1f2f98ea9041ed88c6cee206ee3260ff60387 SHA-256: 3a99c6780ba991f965e3edbcd99b981b11a432ae9b696fae78b36268a9593442
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://ekogamma.pl/javascript/ckfinder/userfiles/files/14650209846.pdf
    • http://szjg.hu/images/file/44370024647.pdf
    • http://diennuocdanang.com/uploads/image/files/85450182658.pdf
    • https://calendarsunrooms.com/userfiles/files/wenarofilutekepajutun.pdf
    • http://dzbnf.com/upload/file///75083048977.pdf
    • http://ozhelalikram.de/resimler/files/9597938776.pdf
    • http://kleinschaden-expert.de/userfiles/file/gukoxakalofolobubufav.pdf
    • http://halongwave.com/userfiles/file/xakikexan.pdf
    • https://sukienmiennam.com/userupload/files/kozutegelojajegedogot.pdf
    • http://furniture83.com/upload/files/digulaxoborevojo.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d77fefeddf87fed541b9dc709c782f3d/98019152085.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/98363040835.pdf
    • https://minhvuongthuphap.com/upload/ck/files/50154319006.pdf
    • https://topupdana.com/contents/files/xepikamodaf.pdf
    • http://pdww.ru/ckfinder/userfiles/files/gumewivikamiri.pdf
    • https://jeanmarcrobion.fr/userfiles/file/xabububutagovevo.pdf
    • https://daotaolaixesontay.com/uploads/file/wuzipevumujota.pdf
    • https://sharjahcements.com/images/bulk_images/files/46666981541.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f9dd9a27fb274d1beda591230859b64a/mumukogul.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137644b5caad---40983423651.pdf
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/51375080803.pdf
    • http://cec-intl.ru/app/webroot/files/file/vizikazorirekod.pdf
    • http://centrlita.ru/archive/image/file/xizuredibejowodav.pdf
    • https://szallas-karpatalja.net/upload/kanuginap.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161377382499fb---kezenekejekesawanan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+screen+record+whatsapp+video+call+with+audio+on+iphone
    • 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_off0000edde.bin
315c91e83356f22c96d394cb4061f841a1c60ffe027b78144fdaf1c693cd3298
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 17236 bytes
font_01_sfnt_off00011a74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 16792 bytes
font_02_sfnt_off0001328b.bin
e480786cf128d6db9d1a8f3ba3501b9b8622e7f32f8b4d4d88fbf9e88c0d4767
pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 10852 bytes