Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ac65a29798022f…

MALICIOUS

PDF

93.0 KB Created: 2021-08-04 23:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4ac195b72f6283011f093bdd6509e4ee SHA-1: b14e8b6e07b60c62bdb09ef04631f053398cc466 SHA-256: 45ac65a29798022f886f22f7cf64d41732ce45800dfd2aa90a9a9449d9900d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple compromised CMS upload links strongly suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • 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.
  • 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://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/uihrpn072l46eas402pkucpb4p/dukuz.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff45669d01---68592726606.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16079063dda841---mekakupuxixefuvoto.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3af26e1d2d19d809ff316a88ba4e510c/parerixujaluwekekuxib.pdfIn PDF document text
    • https://bloomeng.com/uploads/renizaxepogerativis.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610629184795e---zenazubuganovijevuzigezif.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/rivoletebukebuw.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a8079f59---denizatusupetedebab.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/sesaxonu.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/32504666094.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4565f70dd5eeca9d98a77f223328af32/kagimoda.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106050538082912.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/matj1tqbsm37qi5bcd8eok9etn/97391551207.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/kofolagogatan.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/tuxituzev.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/20063de7401afb3453d08498bcfccad0/59253865424.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210703_9F6BC29FFC9CE68A.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9a33702cce18d95a823a53aa8ee7ae16/70163521485.pdfIn PDF document text
    • https://menu2uplus.com/images/file/visiforawilevudu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/sobefokarijesijozanesefa.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hbt7hn9o616mkbla23bgcs7fci/75846083517.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/43027646686.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/mumokaxugeboluligage.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gawaxeruweja.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5f73c43cb0defbf74b0f342abe99b8da/24802396610.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/skvotjlm5mpv1j2npak7gqtp5l/fipefijidagilodogi.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/juberi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2bef23c50---girorirarusuruvupolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+much+time+required+to+learn+sqlPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 17048 bytes
SHA-256: 81dcce664a877420e6680301ff67d8eb5010dba6d6dad61e6d9793bfa2b16a0f
font_01_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA9 10956 bytes
SHA-256: 96cae54af5e48d3cef87db247a7067bf6a14810fcfccfbba5eea51f0adb0c5be