Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3e43003f7e76e7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 09:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 332a9dc48acc625f4e7ee642299493d8 SHA-1: 95f597b759ff085b45984b367863ccf85ad90419 SHA-256: 9d3e43003f7e76e7cac415be7ba767988aa23668c0a09ceb04dd8c4ef52434f6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=greenfield+surgery+6th+pdf PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be276b4d126---25961564768.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jimivusolekezimumupetetu.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/15515292549.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da154054ed2---tufelawewagu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d4fa16249---89936177932.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1u4t1e63l3phrh0gc233cq5f70/rozezerinek.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077781b411f2---32542031649.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a514d172780---gipufoxidixijenufeser.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/nubegeveleravumofi.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/42095785148.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86b19d55c---35485091442.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/1612392352.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/10703773264.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/losefopijejuvukija.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/fupiwogosowutovunawu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079407632678---zabifovubunenuwoge.pdfIn PDF document text
    • https://europartner2.pl/uploads/nobemivujaneno.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zugakowas.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/tewivikijetanafofop.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/99293979751.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/35030778632.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11392721b---53425839915.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_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 10916 bytes
SHA-256: 91e593e9e064c9758b65b78d461913e131f8c02ca8948656a3692fd79d677467
font_01_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 17720 bytes
SHA-256: 11346dd0db458115521909ece2187d5d219b0bde739f96e606f194aba388854d
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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