Malicious PDF — malware analysis report

Static analysis result for SHA-256 916be787f656a4b9…

MALICIOUS

PDF

63.7 KB Created: 2021-09-02 09:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 760ebf22093add427c15401474ee444a SHA-1: 01673ccba067c99698feeb61e7d88e48de40fffa SHA-256: 916be787f656a4b9f94f68db6b424cc8819571a8fbe290307d12e0e08044727e
154 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8221

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://pkynfe.net/userfiles/file/55594528631.pdf In PDF document text
    • http://krzeptowski.pl/file/68767844850.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7b326929ae2a42510b9b3a77d576620e/bopijil.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16210625336384.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/21285165173.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/17238695817.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8446532d5c---gagil.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/wesixilepofivatate.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d7bdd04142cb2bb81792cd13492311a5/gixusunalimelenusupujixap.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/vebamivaxiwimigukunemuw.pdfIn PDF document text
    • http://school15-tyumen.ru/f/33121055865.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/88948376672.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/45977289972.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/213edc4658b39d4bee9a692a81588d35/muzozokiviresutalobenafa.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/11308860761.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/2127b67adfd3ac4fa48b2cac517b694d/81704489545.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b1dd1d4a---74742181051.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608159bf37a8e---zopume.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1e16a756b688a586daf87b30018dc1d2/vopabujoviri.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kl6gkca47gffjm14t7pbcsfaic/38200362540.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/64021101352.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/55782101301.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/61308985969.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/53u27aapbf937q572u11rl5oda/wikujagefimanuz.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/pibaxevowoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cold+air+and+breathingPDF 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_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 15216 bytes
SHA-256: 081d6f39971cd4910599ada7c00bf47f157467967f1ceffdb192930d1b4000ae
font_01_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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