Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa5177b293d64f7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 06:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93cf2a1e57992042189384df625c782b SHA-1: e036495f10b30a57e72398056f1f0222b39209f1 SHA-256: 5aa5177b293d64f702552516a83dfd15ab91ca8588d26af9d12384df98278464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://giasuminhtam.com/Images_upload/files/86267871099.pdf In PDF document text
    • https://powermailer.in/userfiles/file/58149175444.pdfIn PDF document text
    • http://wenxuezj.com/images/File/32191188609.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/nekudakenanasaza.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/jusakijowisilulijokijeso.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/larago.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612620fd2313d---vosoguzabuje.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/g3k900tujtnpco9e3n5ompv32e/kesepe.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4afce22510---12022218921.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/podefozilitezu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a97320f4f3021eb3abac02c363e08b5e/riwakapitikubatu.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/baxafirolemukebuneriw.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/48670348310.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32c0e393f---50700547281.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/wotudixiwunin.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/61012349928.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bsjob744s0g1cr9mnidro2e7i7/55141311111.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2ccdfcb6404b40013589f40653f6431b/nezetajerexev.pdfIn PDF document text
    • https://advik.net/userfiles/file/7096633601.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/64943025910.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/36926385709.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///25660069043.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/71120907407.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3c229c87b---bixetovixidimofatovofuji.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/89358923400.pdfIn PDF document text
    • http://cpviettin.com/upload/files/vobuxumefikumuxiweje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=importance+of+intrapreneurship+in+an+organization+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_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 11132 bytes
SHA-256: 669e6df6e9ca5d0a233050253fba5156915034604a07e48abfd888bc59a79840
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 17240 bytes
SHA-256: d68389e388ef920d79aebfbbde3c258f0c630ccc7a04127f7e7d8fc739e69d42

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