Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc110542856a521…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 22:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f03cab92b3905e854b0988011cad1d73 SHA-1: 870fee0837b530c170fc8547d416cd69797a3f19 SHA-256: 8cc110542856a52154a25e0242de38974d928b5f6f1e22dc95a66443b479a6c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple link farm heuristics and numerous unknown URLs indicates an attempt to obscure the final destination and potentially host phishing content or malware. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://densayhongngoai.com/uploads/userfiles/file/gojivulamolejugaje.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7a46d945ed81288922d6cfba3ce0f0d6/18981144511.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/83032662585.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/58316523b7b71adb7cba30aa240b13b7/titefutu.pdf
    • http://leaguengn.com/userfiles/file///20866222233.pdf
    • http://pusancard.com/userData/board/file/jakenivegilipotutefenuli.pdf
    • http://efuturesthai.com/uploads/file/2374490786.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5248157cf---90920560775.pdf
    • http://rc-mst.com/mst/_upload/files/wegosuzetifipide.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/72888452296.pdf
    • https://hizlipin.com/calisma2/files/uploads/vizuzumuvimotar.pdf
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/8781329552.pdf
    • http://maychamsocda.vn/images/userfiles/file/73877042321.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/77130238631.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a735d211455---92593785120.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9d6c47cebe6e55703b4e0ce13122e2f4/82251132071.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/tufugodebutenagalo.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160704447f1b42---42653507786.pdf
    • http://gibisch.biz/files/files/lejaxanuxekisosazar.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210724121253.pdf
    • http://thefarmatarapahoecounty.com/userimages/sozokibujejisizezetiviv.pdf
    • http://insfilings.com/skyzone_classic/upload/files/rojiwugavuzosuj.pdf
    • http://musclecar-taps.com/js/upload/files/marirerogazijabe.pdf
    • http://aceonlinementors.com/userfiles/file/visaxowavakudibesakod.pdf
    • http://www.anjhimayath.com/upload/file/reworewasigufewojaxano.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=nodulos+reumatoides+pdf
    • 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_off0000b66f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 16792 bytes
font_01_sfnt_off0000ce81.bin
d4cfdf765d9f2a252fba2bca63a7c235e476063eef7358946f77011af80c6fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 14488 bytes
font_02_sfnt_off0000f301.bin
9d872d34eafd596dec99f4d5bd0d48b0cb078c4108c64e8d56f9a88a1ecd8280
pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10632 bytes