Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58cae332a41cc9e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 18:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e41fc4b2f8ef65c7519d1fc2f663de30 SHA-1: 51b293c7e69d063cae6442fee138923d6c364690 SHA-256: d58cae332a41cc9e4f2554606412c44705711ebffc9a324ab690a72f72c41bed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://ego-sofa.tw/uploads/files/202109170009467454.pdf In PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/16761408326.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vabejexonivuzivaje.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888bc29d86---28176820089.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/8483453320.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/vepizug.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/38000552660.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/58261b91bbc1bb6b162e4488f04b4600/juloxuzapaxosit.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/72304519388.pdfIn PDF document text
    • https://artenika.pl/fck/file/zadavafetenobezuxuxaxoni.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/segegedimodoniwedapitugov.pdfIn PDF document text
    • http://freewest.at/12689583908.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/7390717961.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/kolanafawepu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613693d60db5d---84245896999.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe49457af---gojemabap.pdfIn PDF document text
    • https://coevent.ru/upload/files/nanenukigapitageme.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/oe0mm5k32u18jmp9o3enr8tpf1/gewolurunuwu.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/41064263938.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/99895083333.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/72392477004.pdfIn PDF document text
    • http://espwireless.net/uploads/file/53289664486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mortal+kombat+sub+zero+2021PDF link annotation
    • 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_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 10752 bytes
SHA-256: 0a0c1460f41657407e6e95723f4617561f457252670c16e59f22cce4ce9a1c1a
font_01_sfnt_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 19260 bytes
SHA-256: 599c59955a545571c32226368a1dc8ac0a54fc04d892fea04811a9276fa169e0
font_02_sfnt_off000119c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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