Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba77f9d26abc2013…

MALICIOUS

PDF

87.8 KB Created: 2021-07-18 17:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e61f3c06856cef57e6fbbc1fc429dee5 SHA-1: 859be01f03576b56223322404d5d6d3854131ff9 SHA-256: ba77f9d26abc2013e9e256a2f52d942ab45bf87adb11a96e85588560bc2111cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://adamlegal.com/userfiles/file/50258622786.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f49d0d6e0---73668083539.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/19b927fed45e5b99acf6e6c51b253c62/rurujuwewixazekuvimusokow.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/chls6trdi1hrq301eicpdk1fag/79784710900.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1abdb9401c---nofotam.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/ripewabodamiwuponilededo.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c87f1fe7c---43866894955.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa984e6531---rapobogek.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e889c253---pirodorelaxalaze.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d9fb8dc11---repag.pdf
    • http://theheavent.com/userfiles/files/zedudekorozusixite.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6d1909c35e78aea9eae104deca86890f/90720002933.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/dizifite.pdf
    • https://callalilyvn.com/upload/files/munuponuvokajatewirezepev.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2b471db5---vojogodabanude.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6fge0hb4027h71jpdfeai93bh3/zixikokojefenaxe.pdf
    • http://morethancars.nl/uploads/edytor/file/pededunagalaje.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b5402d7f---rimepazopifi.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f1929475---losirobeluvopem.pdf
    • http://movitecnic.com/ressource/site-image/files/55077232209.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b281973842---38848482555.pdf
    • http://lu67.com/clients/50962/File/fulokepoxamopakofapak.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edffb5e9cf7---tudefatebajonives.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9d4ee0e6958216813bf2fedeb8f48853/43442552572.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+thanksgiving+vacations
    • 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_off0000f4e9.bin
391a3b7fbb3260e95ceea6f1f3c18308d6b1bff3f7e57d0ef6690f089960ef8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 10572 bytes
font_01_sfnt_off00010d19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 16792 bytes
font_02_sfnt_off0001252b.bin
3540cd53be634cf380287dc86d8b0635df4e52d231fa4ef9c8565dc863139550
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 17236 bytes