Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fd66d29fa7b2b4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 13:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 335f198e43bcc90ab1d795de0ee9ea04 SHA-1: 8f95e2cb9c7f2f9cd3b2e992fd88a968202c764b SHA-256: 00fd66d29fa7b2b4aa7b1897c25834ed73e5ec896e6a86566914ec5b9de09663
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://viettranslators.com/webroot/img/files/65595514264.pdf In PDF document text
    • https://marathonblainville.com/userfiles/files/zuvovapudofumutiwoxi.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/38682841057.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/tizurapuxefukigusexud.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b24603b56---sitawoguwavuzimixu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161408261d79e8---54500903252.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/fufukesuwavobemuvavopa.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/varazinadubofomisafe.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/bumumebezep.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/64345347030.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210902220452.pdfIn PDF document text
    • https://zhansq.cn/upload/file/36262392286.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/vuditunatuw.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/goxajiwobafududiduxalal.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/bodiwuwabuk.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/38443530762.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9519ebe0---purifitiduxukizo.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/sidaxowanitenak.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/bujitajaz.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/16198359810.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210910_B413DBA6E43C2D89.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/79930629474.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/64714826559.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/41284602960.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109051734267439.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/84779857699.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/70718149109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+limit+network+speedPDF 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_off0000c400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16052 bytes
SHA-256: ca961f5c2588100f894918f7b7577a9307eff168e32d1b7852635bd4fc65527f
font_02_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 10552 bytes
SHA-256: 12032abe32a7ba5cfac833dc9d613132bb9b4e1c1b4c1bda7d2be48984336032

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