Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb03c56a680f551…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 13:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02c2070789cd05dfbc9be60419b36c02 SHA-1: 1d750558b531009ca154cb7b0f26fa8554b8489a SHA-256: 7fb03c56a680f5514b32eba5ef7ef97cf5a6b492c1e3432f493799bcac162e7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several heuristics indicate the document is part of a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://www.hgbehringer.de/img/files/files/84978643707.pdf In PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/pojavizukumezalo.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/gikulin.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/34704950827.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/47851321352.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614598d96e3f9---25962837894.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/86631504172.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/dutafotenuvawugegowab.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///bepipudidunedofot.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303fc138cf1---19833038254.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/sopikuden.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kibopajuvid.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/bowedagiwovenana.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/m5en438u1ujvfpc7452umjt7pf4ko8j3/negilefojitatepij.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/82423835966.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/pazukebusatasufe.pdfIn PDF document text
    • http://coolscape.info/images/files/wusivumumopu.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/kudegasoxugesokuniz.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/potamafewotegawukomaf.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/45168055726.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/79808837566.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/ribimodonagigur.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///85242926602.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/63044832352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=can+iphone+run+androidPDF 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_off0000bf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 17192 bytes
SHA-256: ffabeff7a6d0a3a105fe7496a1a7e5ced95806de79b2ad990d2befa971f5d345
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10308 bytes
SHA-256: d452ba8afcb851fc0ecc8e13807bc8f296bf465a2baea83d1ae0f1f396e90e7a