Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b60e0e13b7c3482…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 08:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16b95650ea2199eedd02adc3fa162953 SHA-1: b766eced513502e999fc2c753a9f20301aa2b1cb SHA-256: 9b60e0e13b7c3482644197198b90d2339b6f88d267eafdd707165f17e88f3b16
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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 http://sys-svinding.dk/userfiles/file/67360306966.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a682ec39a8---rapodejivorerewakof.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6663b31a4b45cd3475b4b79045e12524/26576816382.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26302205944.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/5502946016.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/19dm0rjgmjvlua9cuv46mheu3r/menaji.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/rawegil.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/jixiziva.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t1rrp1n4vkkeagjq9iiu2334b1/35851384850.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6b8d72081---75647838970.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b82340ac69f---gadilotofutuw.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/7468319656.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2750e793597f35774dfb03b4a6434d54/14105293210.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/nonoregitoludasidus.pdfIn PDF document text
    • https://ckmandarin.com/uploads/kulesikenafozelajudi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7cfca78500622e028fc44525e930c767/ratafuvisofaropara.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dukubi.pdfIn PDF document text
    • http://evola.it/userfiles/files/zovojuvosadelasefeji.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sopidupufosilufufevoxoduw.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/subazuvazafipu.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///70862835771.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rugpvb9ht7td6bmb1hghubarf5/fasopapuji.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/97872829659.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/xawavitufamitel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mapa+turistico+belgica+pdfPDF link annotation
    • 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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 10924 bytes
SHA-256: 2ad5e54d2df481e64eacebdb9662e9c9961662c2e5697d541a5e871fe16c284a
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 19540 bytes
SHA-256: 73730fe68fe5c2a7e92f74ceded9521732444639961c90c52c7cec94025be639