Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a20d215a321960…

MALICIOUS

PDF

72.4 KB Created: 2021-09-15 10:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d802b3e36980e693fc3d30acde032cab SHA-1: ce0eb538edd2f90ed45e75abaa8ecae16ff64d27 SHA-256: a9a20d215a321960cc9a2f0a4006d087dbeee61dc7c6fd919f607a69e0effc7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm characteristics indicates an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=the+best+pdf+reader+for+windows PDF link annotation
    • http://gloteckr.com/upload/editor/file/kununapedudidesitanotem.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355d7dc6775---kajegalibavibozirinazixi.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/bodutaxisuzikevipa.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6d57e719bfef8f06616af0e40a4b5b0c/pilivojupawifupisonezer.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9pmmqfu6sgas80r4e0pn2s566p/sowisupo.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/bizidukotobu.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/xesijiloluwi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141766f29ef4---29213709.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/29513839809.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/nejuwi.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/veguvidosorugogilafudula.pdfIn PDF document text
    • https://asiapharma.la/files/files/54759248440.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f790299793---zefodapiz.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/netaso.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/xiwapikete.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2dc310bf---watozaros.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9b1e59a0711ac12c04635b80ddd26058/vakawubogatufotele.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/88495934303.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090946194414.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/gomituxatobujorovivazeru.pdfIn PDF document text
    • https://red-adlay.com/upload/files/funijulolinojud.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613501ea85853---77325768089.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/bamogiremililixixisam.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_off0000ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 16248 bytes
SHA-256: 0bd63d1e1c9660453590497878aa9d11021fcbd0cc9a66f4d6a8d9e92a10fe05
font_01_sfnt_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 10736 bytes
SHA-256: 9b53ab733807383b36831e476a07eca4de4a0fd90ae28fe7a1df901f69e20be0
font_02_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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