Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7b2742b5a9d71d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 23:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77ad838066ab4039f7f6546ae368af10 SHA-1: ef27a623f84d66f8f67c2e8727facf178901fc99 SHA-256: ce7b2742b5a9d71d552e8636953e0cbd3572a3dbb7ce6472615d4ac36202bf38
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://domingo.hu/ckfinder/userfiles/files/99816600620.pdf In PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/39288164707.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rrbespkqkqfnm0fqj5v561f74j/dejogibegobovojizagudol.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/fijadix.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/fugaxuge.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/31826b973601137c4a87ba1b49a883a6/45982313143.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e069d5a63---5161795741.pdfIn PDF document text
    • http://maksimetall.ru/files/luponajozo.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/43556606784.pdfIn PDF document text
    • https://questyme.com/userfiles/file/vewex.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wakorerikibegox.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/89301054321.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/15683656777.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/jokokeguwelodiwupidejig.pdfIn PDF document text
    • https://oferta.lt/i/File/47010806331.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/jojuxipar.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/80564331219.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/lokope.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gijegafulirogerinubidib.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/topipezotufe.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161408e85bc85b---kiweviwiga.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/25935308509.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_015550_154.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/95121477097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=xiaomi+redmi+9+wifi+problemPDF 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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 10692 bytes
SHA-256: 61aab00c8f77eff17a0a80bb965cb35e2744f5a6e3e5ae4ece97b47a8ebdebc0
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 14640 bytes
SHA-256: 3298d6005a95ab84905247c22e4ab62134d281a6d90f5b5de2fe48ff557c9439
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1