Malicious PDF — malware analysis report

Static analysis result for SHA-256 377cc34286ba3d41…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 20:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67c940af42d5e1c01296349acf8090d4 SHA-1: 7f3b361169c8d7066b3cc3f61db9b8883a283eee SHA-256: 377cc34286ba3d417329c2f0ec17850d921265fb9679f46fcb595a4423d77eec
204 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and presents a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to trick users into downloading malware or revealing credentials. The document also contains numerous links to potentially compromised websites, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/5817996410.pdf In PDF document text
    • https://lensmam.com/userfiles/file/74299112246.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/xekenibekipakedomilu.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210916230308.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixesajiwiradejoma.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kavatoxizefetenodajesarim.pdfIn PDF document text
    • https://edex.co/userfiles/files/rogololupobelovexovugos.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/fupisebupofofexisag.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/7312073398.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/32a0b7e18d168940b5c4a4b756f1f7c2/47725115188.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/6087259702.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/bokorezexufiki.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///16750272974.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/tinukupovu.pdfIn PDF document text
    • http://furniture83.com/upload/files/digulaxoborevojo.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/ditavif.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/seniti.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/raguviwetezifimerax.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/sibupujaduluvevevilad.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/65467429700.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8309caf7bbcbc9805818c50b00356a7a/sujotep.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/36643194254.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/6091276149.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161307ecb8cdc3---2697401907.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/marojonufefatedufozo.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef00bb7883---91164637100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+transfer+android+data+to+new+iphonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 17176 bytes
SHA-256: afde9b7f9db51f01c53f619a8bd702d336bf6a90b9fc5d6ce56957465b8b23f9
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 10628 bytes
SHA-256: db1f7b7f42e85e3f54472cd080841f192d35c2ae1f9d35f5c5329bc872a885ca

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