Malicious PDF — malware analysis report

Static analysis result for SHA-256 643f0311c22ab09c…

MALICIOUS

PDF

113.1 KB Created: 2021-08-05 06:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8202a2a31aedca19d1e68bd981ddc08c SHA-1: 7bbab1e1ab4477550e34cf72744964cb990d76cc SHA-256: 643f0311c22ab09cb15674d041822674ac8672237db4b6deaaa4f3dea4c46bc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 https://rubenoferro.com/userfiles/file/91559693245.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/51f58f5307dba9bcd1aac30ba9b5c479/nezobirikifuwatomo.pdf
    • http://48bulls.com/js/upload/files/80623229415.pdf
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/23637797559.pdf
    • http://smartvoicecom.com/userfiles/kevufo.pdf
    • https://asset-books.com/userfiles/file/ritijiluwisatitexuninazix.pdf
    • https://alate.org/admin/fckeditor/editorfile/vadov.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/mobefonegeresato.pdf
    • http://boathousebrokerage.com/userfiles/file/80285203823.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/qr0b7qvg169nssencketi83410/62226038521.pdf
    • http://rocb-ap.org/file_media/file_image/file/16646717358.pdf
    • http://jump360.co/upload/files/20210622200854.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/423176f6239302204e0dfbed565d897d/jukewazifumadexitofolopi.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/23015tf403rnt2ubljfiebihhi/1847985834.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7246486563---sadujakujuzubilujuxu.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/81049025919.pdf
    • http://aceonlinementors.com/userfiles/file/vedejekofisaxegazar.pdf
    • http://xaydunglenguyen.vn/upload/files/0fac7c.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/s0l2h50oj8t86qfiabphdhpr8p/62532118139.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc812051b43182557639ffca9fc7f400/53070733468.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e6a95228986ee0e4da202557b304160d/30679699925.pdf
    • http://vejwun.cz/images/95814813330.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3089c95af021c66591d7b1c1226973eb/86402081639.pdf
    • http://kmkonsult.cz/userfiles/file/rugamikokub.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081383be6f75---fonegexamagozuwuda.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/28735211152.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sabarimala+temple+opening+dates+february+2020
    • 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_off0001560a.bin
d865994a00d73ce598564d428570f433761e8c189288877403ed9f841cc2a3d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1560A 17660 bytes
font_01_sfnt_off00018372.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18372 16792 bytes
font_02_sfnt_off00019b89.bin
c3b7a286fc037cb48f6a78b7f38c815d09ccc863c554160e50cb3bd3ea35d260
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B89 11512 bytes