Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05a76a0a9eadcd1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 00:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46482d9b75a0b7378b610e5fa37a4753 SHA-1: 8eed6e811310dee15c371faac9c9ba3052831280 SHA-256: c05a76a0a9eadcd1dc4b8e2e3e94594837ba105608b83437e9086b41ceb5cf51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a lure related to photo editing applications, likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=application+de+retouche+photo+android PDF link annotation
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nixutu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372d59690bb---37028871987.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010812161314.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/31902612638.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/dugikozaxutosuwumunub.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f73c64d6---31739477713.pdfIn PDF document text
    • https://flyags.com/editorResources/file///14780585872.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/moxusetawa.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/konujevijasufobon.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_E9CCD97E0F17D447.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b889c83c1---24915932122.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/zisabagafagedakut.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/filipov.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/95518782461.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/nuvibon.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/o082f91aj6f013pg1s1sir6icr/40369185608.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/57828822870.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/fitok.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/59913447699.pdfIn PDF document text
    • http://bubb.cn/up_file/file/52177565518.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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 10524 bytes
SHA-256: 7fc90b9fcb73aa94122e1d485ed08c78e7edd997d44502695c4098f3dec2d959
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 17156 bytes
SHA-256: 29e04e6981cfa637f7960ae8a6bcf1aee073e2592d25a0c69f0cbcdbe842613e
font_02_sfnt_off00012882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1