Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a7bbaafd9a975f…

MALICIOUS

PDF

224.0 KB Created: 2021-07-18 11:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6e1fd840daffd92c7ef536ae6382b4a4 SHA-1: 6e00e8f905e73d935517deab52efc4854130a9b7 SHA-256: b1a7bbaafd9a975fd0ffa8a896beda2e5e51370334738c8c2bfb715c6c2014d4
174 Risk Score

Malware Insights

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

This PDF sample contains embedded JavaScript and links to compromised WordPress upload storage, indicating it is designed to deliver a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The primary attack vector appears to be a lure for free downloads, redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://dieta-plus.pl/userfiles/file/buvogibefe.pdf In PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4794b003846e3c9b83cb9deca20bc13f/dagimanu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc828a74b---81997074690.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/gaditolekum.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/45670081704.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6d6f08a4fb98ed301860eb6ec5b2b3c3/sanodogupub.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/zakak.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/abfefec9d41bd150812195534ffc204a/pikunosenuzowawi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/2501466456.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbbbcc77b---68697326509.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4197aec8e40fa748e1685630eeff0455/56029073984.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/delofajo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca8b6d68f---73492109841.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e6f15e63---6874361217.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/xevonugesa.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/42041143463.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd28c062b0---84232957147.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a05da5c81a11cc288885dc2dcfe1882a/bejunozutizalumajakeru.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zirawawumaxaxijis.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/zusini.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/duwemoralofuluve.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160884a8a64558---luduzoxakagavepafumura.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb2f064137---93629468686.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qt93pgad97fgesn8dg3ovjunva/55860486912.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6956143243---dakupikipivefaliwamuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ht456+timer+manualPDF 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_off00031640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00032e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E52 16740 bytes
SHA-256: cd2103a023a05d9dbdb8ad97cdb20a58b6bd2363e88ffe19f98071d1e4590a4c
font_02_sfnt_off000359c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x359C7 10452 bytes
SHA-256: 9ded0e7dbd195350e674e0ec636f6c9af1d14f7594774f766ab7f86358e80f39