Malicious PDF — malware analysis report

Static analysis result for SHA-256 e388c0fe06d92813…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 08:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51348786b79fb6105bc831ec52a6fa39 SHA-1: bc3e4d739e008bcc054c4e04cda09cc4276d3d27 SHA-256: e388c0fe06d9281362bcb535243ad8658b3fd2cbc4efd5ad14fe9c1be9a20249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, likely for SEO poisoning or phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://santchavarabed.in/ckfinder/userfiles/files/75287728560.pdf In PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/dedawiwanunefiretopenon.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mulavoduzozi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/56837763441.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/junev.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/83953555108.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/65874416991.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0293cbe2fa154c45c6610dda2d6b0121/pedabiwexizawen.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/76768878780.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/pafinesofosilajuzaxepin.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/sadigo.pdfIn PDF document text
    • https://triosms.com/userfiles/file/51193780179.pdfIn PDF document text
    • http://recrute.fr/files/files/xomepavekinedote.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hiqu0f3urdatflerbg5v8so0s3/sepofipirotipeme.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/vapamasaxinubomitabujafu.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/nemejuribezatajumub.pdfIn PDF document text
    • http://bakoca.hu/files/file/fobuvajijuwevalutuni.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/loxavivigetefibi.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109012345457889.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/82098388277.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/45476262952.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/91237705415.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///93689237349.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16133dadd4dff2---pijumukazelidomixabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=examples+of+insectsPDF 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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 17068 bytes
SHA-256: 38288740527ffccae1f62500e7d4a94cd3081f4a4a868dfcf2605b2240b3b0ed
font_01_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 10628 bytes
SHA-256: 2c3119aabab3399676bfcdd3b0b58da1533abe5806c698a559201b6261e6a22e
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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