Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bb703c58d80c1a…

MALICIOUS

PDF

79.3 KB Created: 2021-06-26 23:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a407440d734c81eddc1260c4d3b3d82 SHA-1: ea9f94c5d54a210ef726d6f5d1ae06ff5049aa0b SHA-256: e5bb703c58d80c1a4d851c1305accbc0876e3942cda0be1fece00d42fe1f3a50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn leads to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://midel.me/userfiles/file/metisaper.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c598642042---gunasasonilutuxu.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fcaa1ba97af1ab27efaf9b4b35c28bd7/figidulasutubu.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/gosogonitagokigujorewitem.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7fb70482f232d3340bf2a2a242e89c38/duxiwidojefoxolovabopebu.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/29814579945.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3mbde8ut79asc3maotli1mg4m0/59136356927.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fenukenujili.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb23906d2---83251660645.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19ea40cf0---67275723224.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092eded8eb0d---jigoloxuxade.pdf
    • http://ldbell1965.net/clients/85689/File/75426258368.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7835c86a6ef89999538e4efe19c70c1b/mijozenoxerezelurulexu.pdf
    • http://www.bash.cl/media/file/7833967400.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160716773e6843---degofisuligigu.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/971da7cc46026b3125db2b90721464df/jivilotelo.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1e21fb5b75b6f0a99fbd743ac2ac02d8/42264744643.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf84a974c---19148865655.pdf
    • http://pokemom2.com/uploads/files/68833251202.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/37875231062be24331ded8751835a191/bumijofeje.pdf
    • http://www.rify.us/cms-uploads/files/93526485099.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/71bb3217ff92ba120b42da94e72849e9/zawifuzan.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8bcaca71bbf8bf163d6f8b593b2645b6/sokanew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=length+of+seconds+pendulum+on+moon
    • 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_off0000d0ab.bin
142b3fbdd2e38e3092f362dd40c1b59e873bc9270c69d35dce72eb8a879f4a39
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 17652 bytes
font_01_sfnt_off0000ffc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 16792 bytes
font_02_sfnt_off000117d8.bin
097917154a4f47d7f282dc6484e5b431c2d2f4b3f883626b791d7deb3d620e19
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 10768 bytes