Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1df5ba8086a06c3…

MALICIOUS

PDF

90.3 KB Created: 2021-06-28 11:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e27b6040e751985f6a79dc8c52b7010 SHA-1: 8f78547714ac07b2550c47850201216dd6f91da0 SHA-256: f1df5ba8086a06c3a7b008460ce9ad889c60e3ffea8df581dd83fa53447a23e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to further obfuscate the malicious redirection or download additional payloads, while the link farm aims to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/32bfd1b60bd6d592e2c1cba132842789/2067631722.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098429886380---fujujemizopunavatidup.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/r9ljs2gi1gqb954ec0j27du93g/kabigo.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/fefute.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ffe34cb9---bozotavupo.pdf
    • http://kristenpell.com/userfiles/files/gusosuboximijozedi.pdf
    • http://jarosi.hu/files/file/rimogogorurekomata.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b4fae8e89eeadda0567b6184f37b238d/84984249867.pdf
    • http://bptramptour.pl/files/file/zubazinawuguxoxi.pdf
    • https://okna-stv.ru/userfiles/files/konutikoj.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f8a9677cf---38819837158.pdf
    • http://haphadoor.com/upload/files/46907511429.pdf
    • http://nutronicltd.com/userfiles/file/lerapefazo.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/n5nreeq0mul00hc18p1ms9f6hf/55930130015.pdf
    • https://bestofbucerias.com/upload/file/90465966159.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608255fd2e350---ribulexuzesepotar.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c580e02d4c6---65954876334.pdf
    • https://botorka.ro/userfiles/file/jejamovonikuvepatovivuf.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/lanege.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/fd4ec9925a75b14dbaf770dc2199e6bb/rebanijazisos.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbd8c388f---gibomupu.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/400527cf9393d99d31460d2af79ea16f/raroximodafubamop.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6deb366573ffa8ec43cb012092c8891f/18322129240.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc816da3f2---taluzawadamajafojetuzusok.pdf
    • https://atlastoursntravels.com/userfiles/file/68096883484.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=directions+to+enterprise
    • 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_off000100fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
font_01_sfnt_off0001190c.bin
cb6a589b9664d87f289eeb63d8f6c557c865b74ff7d353c5df1802e1c18cce03
pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 16916 bytes
font_02_sfnt_off00014520.bin
dcc107dbade841698ca5631572af466f90b7d54dd62cc46743ebb1dc2322a23c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14520 10160 bytes