Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e75d9e07c891c34…

MALICIOUS

PDF

77.6 KB Created: 2021-08-08 16:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6f4e11f7df937cea435154b7c355d49 SHA-1: d05e0bf6f9815958249eba03b7b6eb04db9d5ccd SHA-256: 1e75d9e07c891c34e5e55a1767666adce2ce7647470c96f62d39b149ea46a2f0
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5131

Heuristics 5

  • 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
  • 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://nakamurasangyou.jp/app/webroot/uploads/files/19933595455.pdf In PDF document text
    • http://tries.cz/media/images/upload/file/pobazijoga.pdfIn PDF document text
    • https://plasy.com/uploads/file/vumixo.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/61747959857.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/86885732490.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xareligarugo.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/midowajapaxigiwiwojosowam.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/suxejusevigeme.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f211bf348a---50870909609.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/junukosebikadajejovuma.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1573eef64---27599636951.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/273bd8552ecaca0e2bb2ee8f6a9748b9/muras.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160901254de5e1---55630824010.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/58128483261.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070937a6b5ff---74323144530.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b1f64d6ba---20389800451.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ba3e839ee857c505a5f37307d6e304eb/80979147721.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a2e57595d2b1d18140460471b65d08fb/94264355986.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jilaresu.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zubenurebevabusunemu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcf982ad4---jedadowazi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/14c1456f1637427d10c9a0298bce8180/juluki.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f39f1623---25010118643.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/72040818794.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d3b2d2243678f94984a553ae55c6c2f5/40123038154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=carolina+garcia+sayan+esposa+de+raul+romeroPDF 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 11004 bytes
SHA-256: b7401d0760ff8e62dac4e51849c23a93d2aea3d8f4da1e785e09d5233169fbf6