Malicious PDF — malware analysis report

Static analysis result for SHA-256 06fc4c78b04a5088…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 09:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a595fa7c73470ce99950064d773a75cd SHA-1: 2a3b521c3c436c6aaa56a28dcf28db726213fe30 SHA-256: 06fc4c78b04a508868a7718c26cb5d0b641e9b15085ca90358005f11a622c5e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of a link farm on disposable hosting further supports a malicious intent, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5b97b3b74d9153a5e33394c77ff6a40c/napidoraramotud.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8118ca2f5---naluxijemu.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210804084730.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0efe1884---77786478316.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e910104a---92462489113.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b071a549d65---3582317781.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/avdc6li2rh6aqrulbr7bot86ib/tesowuzewuxusajegigo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/ramatowosuf.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c857d6088cb---62796320525.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6fc35b86---majuzewowafutulemegosu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/22923337934.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/84ea8503db4e7a8c2acb13170f006700/8287515281.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/manokurezi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a231653a3---29343221192.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/vobibusinowi.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/gebowupanone.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/98b956e9373fd9e4a1f4705e900cac91/96842438420.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/lodokudemom.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/89637804606.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/dimagipoxib.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/24104771723.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/povanotufeliv.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/jujjt9h2p8gfiufjbn37hqvbp6/65212503729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=qardio+arm+user+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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 18660 bytes
SHA-256: 75de891d5eba9bd67fa1f68fb748d44150371ecf879d4a4cbee8a08458571947
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 10472 bytes
SHA-256: fb3cc89dac0ddfcda50369bf4e5fcd9f90805445cf9729877ccd8ea5c9a89c52

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