Malicious PDF — malware analysis report

Static analysis result for SHA-256 b790fd5b06ed7c6a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 15:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da48fd32c35800d358d5c8e2bd041548 SHA-1: 097d9dda76e07cdd90973f8f0855b7c9063bde50 SHA-256: b790fd5b06ed7c6a5ab8a0fda2c162ce81b7903226a3f0d711dd8cec59b2183f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a download button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149976397796---durojigi.pdf In PDF document text
    • http://sissonne.hu/editor_up/jekerikonev.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/kisafesimaxaleveza.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/rivulazilaxirib.pdfIn PDF document text
    • http://elitacasa.it/images/file/tusem.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/dixuvefetanodimubov.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/59692745307.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e381da9b8---32988232709.pdfIn PDF document text
    • https://yodobashi-church.com/62464760051.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/28be1b0678bceb6e9c6ef32ee8a85c00/bonexuruk.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/19699092708.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/61120462183.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614935efe9acb---kanubinizuforijaxik.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/mutofinebugufuvikenodiki.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/duzijiwubukifudewodako.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/ruroguju.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83602579592.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/dedut.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/togotovisurarem.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/fodugija.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/55853736642.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/25086075477.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/wolojivewejijapafinakep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=below+her+mouth+watch+online+123moviesPDF 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_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 18544 bytes
SHA-256: a18c06a9abea42dafbdc9b9ad304a6c83d09e1b2d6295ab9f6cb50060f7d750a
font_01_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 11144 bytes
SHA-256: a52896bc3f0ea6f0c1a251bec7556b1ada8202209327f5f331e1f54338949ace