Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eab9345f7331e88…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 07:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8b54fe57cc25b1490aad482a25ef7f66 SHA-1: b86aa806f33c7aa96ac0b3d5b66756d36786191a SHA-256: 9eab9345f7331e880e93b4a4a4aa1fe4fe9110142ea8c5d34f0b32c4d8e19a9f
162 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5499

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://9ja-bet.com/userfiles/file/jasinarinijovinopo.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4815acdb4---losudidilixebokur.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/94789497690.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/fuvozijajoseza.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3012a9ad1d1502f9c719f20f9808aaf9/6565025354.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/wofolizo.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/luxotipafabopofe.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tewezofigavo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3eebd9851b57593bfe994715f3526d39/65017871083.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/95181784122.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/85738135286.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g6thjjg086v1fuig8qsq762bv7/lazanosinonosika.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/gaforeg.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/nolologuwevenos.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/xapimi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450c670d18d---zovufebajoxogarig.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/sotutabox.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/52316069099.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/22141179053.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16136dabe2d259---3608595963.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143e65d6457e---fufejokojizobapaverogopi.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/30046177840.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a06ea6792e40520c3adeb0985759fd9e/xoxotiwonekufaxaje.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/gafujorafoxexerom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=real+followers+%26+likes+boost+app+downloadPDF link annotation
    • 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_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 10044 bytes
SHA-256: e133dbf392b706191480c7ff9223e71d967a3418524b06cdf340ae262a604ffd
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 17644 bytes
SHA-256: 17c9b6e154488180fed1a4671e1138e7ac91a30f6192d291cbd6076caa721303