Malicious PDF — malware analysis report

Static analysis result for SHA-256 46dcc937341fd63f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 05:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec805899187a1e0c310454864eb2a862 SHA-1: 1bb2cabd387d89cf51640b093bcf5d6a86c1f20a SHA-256: 46dcc937341fd63fc1456580379ee47b6d251e8f151040e247574b87149f7f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a sophisticated effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://susta.vn/userfiles/file/63730017402.pdf In PDF document text
    • http://splogservice.ru/content/file/bejab.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa155c7cb8---85314289372.pdfIn PDF document text
    • https://biocoils.com/img/file/pajemepex.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/nixinowux.pdfIn PDF document text
    • http://shamayachts.com/upload/file/96816339576.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/3811803641.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/xebudinokunij.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/42591367110.pdfIn PDF document text
    • https://derfo.info/resimler/files/gujagufik.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a68c14480b---vululuzupupuduvisemubivun.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2b9df0ca619b8bbb51a454011bf0c3b8/fisaj.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/limukagosozofikotabi.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/jigisuverem.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/tuxiligalita.pdfIn PDF document text
    • http://learningkey.org/userfiles/munojexusimelafaxi.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/lesosojipexezipiji.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607097bbeab97---niwekumi.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/votalajovujimuki.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b21a027cd01adc6e8393d00ca235378b/tarozuzolalaxasilu.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/81220672608.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/901ddf72241538e5389d85b2bc92dea6/73492190055.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fad3cdb0f---revajovaturabasizodi.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/45003553176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=python+programing+for+beginners+pdfPDF 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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 11152 bytes
SHA-256: 490a35a8c7187fe6d75801338bf2a35ca77753afbef46516ab05f57c1cd76ab1
font_02_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 18920 bytes
SHA-256: cebd124649f3862b127f4ec31bb06f0dee96359b774b73fc49fb32d29a2202da

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