Malicious PDF — malware analysis report

Static analysis result for SHA-256 0965b75ec9edce16…

MALICIOUS

PDF

75.7 KB Created: 2021-10-29 21:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e95fe70190ec0700706a246c486b5a9 SHA-1: d58c47b26b0af43a192c56016b78a7ffbe470ff0 SHA-256: 0965b75ec9edce1695d873a25855361445d36462bcce06c950944a869c4359b8
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious or phishing sites.

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://gibidesign.com/fckfiles/file/46563182917.pdf In PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/99228305562.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/sebox.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/ragesagitudawuj.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20211012040025.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/49595198030.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zudawuxuvob.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jrps08ckposgpabaqusr99r231/47045346914.pdfIn PDF document text
    • https://yifff.se/userfiles/file/42875706576.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/96643046947.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/lurugidijik.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/26215915448.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/fetelukarilodolo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617495486697b---9155422813.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20211015_D174FC5E6E70BB0F.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161573468644d9---1730943784.pdfIn PDF document text
    • http://falerisztika.hu/tmp/wexutalesaz.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/68341178755.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/xegipele.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/41285714209.pdfIn PDF document text
    • http://azizolace.cz/images/file/jerejiz.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/80405206227.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/90078217426.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=furnace+blower+directionPDF 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_off0000c673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 10500 bytes
SHA-256: 9738b1d2761bf45fa2bfdc006782e0f9c085d31ce01b36fa4f4664f67612d46e
font_01_sfnt_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 16364 bytes
SHA-256: 2bec906c4612358983fdba20000f42194d8261c13a025fd769b65158fcd99ba5
font_02_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1