Malicious PDF — malware analysis report

Static analysis result for SHA-256 485a2eb51531525b…

MALICIOUS

PDF

91.5 KB Created: 2021-07-08 09:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d191f1b4e547a80349594f44006d4257 SHA-1: 2bdace58a0ef3e502af469fd46ea68087f3166e3 SHA-256: 485a2eb51531525bbdac81d7fbb910e7e524ed8efd0ac45227f9b7a81f93d7a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the use of disposable hosting and a high number of distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kj29gclfe45rg4ib6jtgi1mj2o/31204273681.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160dddd25cad0f---defuwijawisadenavex.pdf
    • http://www.ez4parcel.net/upfile/files/2021/06/18/samubisisa.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a658a833---83369240333.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608971bdb3c55---40424677730.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/42340420148.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/92j6g01d4ciu6o42ve3551kher/zasomepakumaxe.pdf
    • https://allcreaturesinc.com/files/files/88560587380.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3flluhsemqrqkguiqmqbdoui2h/9029226776.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804ed985965---20363235964.pdf
    • https://soechi.id/userfiles/file/jivitamapi.pdf
    • http://afro-safari.com/upload/files/22931907348.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/357847396.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764f7660128---26343372631.pdf
    • http://gd-weimi.com/upfolder/e/files/20210613142501.pdf
    • http://acpiindia.com/userfiles/file/64178455022.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77bbed07e---pixevopoxezodefede.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdef3ae37---febanubufime.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c85aac07e46---livuxagasi.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/9740502751.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/lekofekave.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59d2052d9---32223848869.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/5rag9gjd8dkturi5f2d9a9l931/43264301377.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080d15b5de69---mekiwuwokijidozas.pdf
    • http://aquatrustfina.com/userfiles/file/57409117671.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0fca871ab---ruzawuta.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=use+laptop+as+second+monitor+hdmi+windows+10
    • 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_off000102dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 16792 bytes
font_01_sfnt_off00011af4.bin
1667ae894eef388ee45f8babd7deb55d2c1585e2401429786b76f926ba00e248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 11048 bytes
font_02_sfnt_off00013488.bin
a4ad7ee45869cd1fab7b33874b4063339ae4721a86d89c2b4a4185400e6d35cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 16776 bytes

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