Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7620a695cd88c4d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 19:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb6ed6343c30ac39e77fbda3ce98b47f SHA-1: 121d90b58c68c8f8efa6f378205253d32e7ecb07 SHA-256: e7620a695cd88c4d8754792f1bef0572aeeb4f29b1591e11f690350808c3f64c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://asbu.net/uploads/FCK_files/file/nezimomatazurorovuferi.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/nakudadodusubamewamafid.pdfIn PDF document text
    • http://sinners-party.de/media/file/14630933074.pdfIn PDF document text
    • https://topupdana.com/contents/files/tebenubuxovo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/70491875186.pdfIn PDF document text
    • http://hueide.com/upload/files/12955128386.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/duberaluzutamilesizefo.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/93926988786.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/felukax.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/46767251490.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379a352c39b---lafofawazudef.pdfIn PDF document text
    • http://ed-union05.ru/files/file/61646567817.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/69417267271.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99993977464.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/4424663880.pdfIn PDF document text
    • http://dmkert.hu/files/file/pupazifelewelelix.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/84079431975.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137808f31c2f---36014279744.pdfIn PDF document text
    • http://ombs.ru/uploads/files/6943988288.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tegukawa.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/54885348237.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc33b879---29842079094.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/norexaxeradiwa.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pubapamix.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/21354152650.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/sizaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=alerts+for+androidPDF 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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 18084 bytes
SHA-256: 82a0e94e99398b0d21441b87fe1d42a71de2932538b18a29f5a9595545e182bc
font_01_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 10328 bytes
SHA-256: 0529d34287287e694890f04de89286db3c88567767ea314680b57615f0430d45
font_02_sfnt_off00012652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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