Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a917394342d97b1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 14:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a586b99a443370bd769c72db99bc872 SHA-1: 17697de949723ca78ebbfd15ee8a8d1472d83243 SHA-256: 7a917394342d97b1cc1c99be404f316049879a25f5ef971629bfae985e2756d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the malware detection strongly indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://axi-hohenstein.de/userfiles/file/tifuporo.pdf In PDF document text
    • http://euro-ex.com/images/blog/file/34644700051.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/xefopato.pdfIn PDF document text
    • https://htchninc.com/d/files/lonijavinosopesojawefa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49fb3cdd5---14962950052.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/zeziletos.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/remojuxet.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/79913273407.pdfIn PDF document text
    • http://quetthe.com/upload/files/bikafufotagixuge.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/41653423956.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/70629207103.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9fead6be---pibazudibusidezuperade.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/wasotujoxudif.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1dd4dcd1---45210793294.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/83570824601.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/68812114879.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/pifufolomataxa.pdfIn PDF document text
    • http://hibertek.com/image/files/20210910_220359.pdfIn PDF document text
    • http://henca.com/files/details/file/dedub.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/71350653806.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8ba0b72078a64dcf8095626dd6fa206c/15001045392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=simple+interest+activity+worksheetPDF 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_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 11072 bytes
SHA-256: 753f9dfdbb01266396bc7e328349764e0f8f2df5dd273cd2d81bb577abbcbe83
font_02_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 17680 bytes
SHA-256: e2ed45f6bd64df3e78e97e60a7baa97c7c8cd6da47bb16c6f47334e0ea69e384