Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cee90e58f54662…

MALICIOUS

PDF

104.0 KB Created: 2021-08-12 01:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5067010874f37d19b67243e96798da32 SHA-1: bfecbdac9bdb884717de969a92579040a8479744 SHA-256: 03cee90e58f5466209c68fc1f1091f6c4e22bb79b867b39203a9a8150781bee2
162 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 features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8373

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.
  • 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
  • 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://oniceh.ru/uplcv?utm_term=highland+pitch+deck+powerpoint+template+free+download PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160868904cf4fd---kigufuxisofafepomar.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/sejejaxeta.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads//files/202108040424582498.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6bdd049b0f53c6b4465977b3e5d3300e/14110134801.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8270884b3777d829076cdd6805521a01/33295440488.pdfIn PDF document text
    • http://protok.pro/upload/files/40709233362.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/mewogopo.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/musokemivelixunoxatiwo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/66736542988.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d474b8579e---sazarowurizarixofega.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/95654922124.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/xaxobalowazifaxisagar.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/tadozukab.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/bepimowud.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/dbb93e42caf6df6e7c1eff38bf23e46f/roloxeperav.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wufedikifubirur.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/tuzolewifurewedulejetof.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vikelepuzexeluzi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb567c3efa---riwujoro.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/38707505191.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3fa5e0eb84f38b2d642e676f16b20190/xiwakomebixugumewudereka.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/nolelasudeguweri.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001579e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579E 19704 bytes
SHA-256: 36bf803c4ac0bbe3ac81ac73e5ad20a2cba4985a20fd0af210eeea096980227e
font_01_sfnt_off00018abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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