Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa1d07eb6373f82…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 20:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c13325c477f78aca15d98513a830b8e6 SHA-1: 66a57608a16a6be5fb46a60c4838cdfbad620bf7 SHA-256: 3aa1d07eb6373f82be87cdbd6686c4eb35f656b7e8dcb9c53eb4330751ece307
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiocinti.eu/userfiles/files/60059910587.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2267a2db4---gabuwobopikukodupuwovo.pdf
    • https://esprimagroup.com/userfiles/file/6005885728.pdf
    • https://kawanmto.org/contents/files/19571709169.pdf
    • http://dailitara.lt/bites/uploads/file/61222690602.pdf
    • https://basisangka.com/contents//files/lagelukamozewepifaj.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l9fatb9rak2hs9gvupmag1pn0h/69258775491.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/48c36e07c489f8cd067d19bdb243b5a6/23613440446.pdf
    • http://alituncer.com/userfiles/file/kokitonaw.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/19774028187.pdf
    • https://ancoraeducacion.com/images/walozunaxusopujonuvulix.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/43720327530.pdf
    • http://slstudio.it/userfiles/files/guwefemeropologuger.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e92efdb4---6425177002.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3f6p1v7kcc4ispo9h8qmvhq3d5/xepusejasa.pdf
    • http://phuwangnam.com/user_file/file/pobikuzowuxakujujubuwix.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ffba23b3---pawonurixojujasazezij.pdf
    • http://mxm-hosting.nl/img/editor/file/maduwobigakixisodexula.pdf
    • http://jingyitech.com/uploadfile/wulozoz.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f0b65ec83da5aeef8a0fa9cecdf03570/negapimobana.pdf
    • http://senseoftourism.dk/userfiles/file/18824910473.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610acca506d36---34809224893.pdf
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/83397508975.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/mabuwazonatewiz.pdf
    • https://alsharqcc.com/userfiles/files/xotoganozunaduwas.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/37716777922.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=i+want+to+play+free+solitaire
    • 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_off0000da2f.bin
c62de28c7543677aee26503a0cc41f8689c1bf78a9934a965b139aaa0f60056b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 19436 bytes
font_01_sfnt_off00010c35.bin
8a8eaa5109c2fafe5bc3e67c61369e949c5372ea8f0ac66cd15dc7d511898c15
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 10504 bytes
font_02_sfnt_off00012451.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 16792 bytes