Malicious PDF — malware analysis report

Static analysis result for SHA-256 5867dd8d7bf90fe9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 05:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 431ac520e7fc346c9e86da1b80d5a636 SHA-1: 74231da4f42f6f7a56572952f920c2c42171c322 SHA-256: 5867dd8d7bf90fe93b5ac0fc4a8211110fe1b284d25a41c630823020cc815731
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The presence of embedded JavaScript and a link farm pointing to other PDF files suggests an attempt to distribute further malicious content or phish users. The link farm heuristic indicates a pattern of using compromised WordPress sites for hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://kangshi-you.com/uploads/files/202109060249173200.pdf In PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/kufeworutusedukabagesijiv.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/57041919741.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/44040330815.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/mufekilagatasigutolut.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/63432781341.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/wesudoxurafawut.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/51306568749.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8fbdcf6a---79678052736.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff435b2eb0---42464544626.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/76626776925.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/5678788821.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253ef03d3a---77215423782.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/famuvedomudil.pdfIn PDF document text
    • https://auto826.com/uploads/files/garajotufusemupadodasok.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/63190275421.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/96003026567.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/xinolabukage.pdfIn PDF document text
    • http://htwy.com/upload/file/38122786024.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac65e0bd6---vopaxiwuz.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/gebijefawile.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/4639808501.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/nudofema.pdfIn PDF document text
    • http://sinners-party.de/media/file/zedebodaduripobisosul.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/74703794478.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/72245907923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+clear+history+androidPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/refezobojoledipo.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 10656 bytes
SHA-256: 4b73e4eaa365dd0ec1888f8bf9ef86f6bac4e0e81af420284d818a3d0eaa3580
font_02_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 17972 bytes
SHA-256: 7f1e0f0a1a40359b82d746c9bfcb13b26890aba4f2fbfdf455afe05352f6c166

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