Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e418546ff1bc942…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 10:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 235d8d739ad7b7c9f649248c9336b0d2 SHA-1: 4befd201f8128a2b3e69fdd859a60174e6af2e74 SHA-256: 7e418546ff1bc94288dae44b6f3a825137357c023aaf7bec3b6b802c9bc01d1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware.

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://novitas.ro/files/38912721702.pdf In PDF document text
    • http://sccsfz.org/upload/2021-09/rezaguvofirem.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/mawixuritasar.pdfIn PDF document text
    • http://otczenacts.com/media/files/mafinevatulasekifedo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161304bf34d1a0---figibotowewe.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/rurejizexili.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/22812799104.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/lozaboretulexivis.pdfIn PDF document text
    • http://climtech.com/files/files/15387023722.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/28856188896.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b47ec1dfca56af7915c13dc8d5539753/24500752935.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/36568320959.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/tatetafawoximulivon.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/vafisakubobeledeze.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/gigifapeguveneruzaf.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/gakasomiboder.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/47011097195.pdfIn PDF document text
    • http://nprofit.hk/userfiles/55352918394.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/gavinavinonajulewu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ecaf8b0e224f2b66afa37c96ee6ee70d/romonujajiruzor.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/runakazamunawukomuxusop.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1cf2a18f5---30580306320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=50+shades+of+gray+watch+optionsPDF 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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 17560 bytes
SHA-256: 1d799c4b8cd9566375c4cdd9db3153e0acbf8b0787821f325bbec5c0b3c542ca
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 11212 bytes
SHA-256: 1d364236314dc295fa1590c84af031e693e7c43799607074f953a117facda1ca