Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3d99a10af3713a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 01:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 57bee8a1c74ef79823b5a1face3073e0 SHA-1: abf95db664db652a39e55c17cdb5e72130edba5a SHA-256: fc3d99a10af3713a18cb77265e0d2bf1fecc1e766d2fe9d577e04f217ca4d7cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=you+are+not+beautiful+quotes PDF link annotation
    • https://fonixkoncert.hu/upload/file/gudowejav.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/27193189704.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df98fbdacf---vodep.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed96cc8254---31314411075.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/56387780998.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/26622133196.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/70d9f01393926f87d4dbb94cb694ad3b/59872399465.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/3419808451.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7131c2f7d---24327602828.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d8f8f3e18dfa392c9ba35eb090bc6c37/89495402039.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43931ae42---81450323424.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/abbc4de24dcb858b585444368956b1c0/27168590831.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607dea097b0a4---65706903061.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/mobofixujuk.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/39941744455.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/13980093857.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/55960058541.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985eccd1626---fopoxani.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/tugojok.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a167541ef8e---35519456030.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fd583633---5487436636.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb48179c39---bemixaregolig.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/rasot.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/28671307129.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/lofivuxapawutivipin.pdfIn PDF document text
    • 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_off0000c055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC055 17676 bytes
SHA-256: b583bcf28b5604defcd36c8949c8f48fe6b887eea400003804afd4c253d91d12
font_01_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 10576 bytes
SHA-256: 8246b8ad895aeb74d90e6b4c4060823e9b9e51cf9d3354fa0771d0d2f9fc0785
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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