Malicious PDF — malware analysis report

Static analysis result for SHA-256 26673122d8cb752a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 12:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25898cae423e28fe5b6dd4fe37aa570c SHA-1: c596f2934fc66ae0ee516a4c41ff48909c831f50 SHA-256: 26673122d8cb752a658b8b6862246c121e5f901f554f0ee856e83164f8d60d55
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tocbirsen.org.tr/ckfinder/userfiles/files/70709383329.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426e021ac02---76211002311.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/xexojun.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/vezalefekugozu.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1630555395.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210913_190336.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/pujunolamojupawalido.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jidixazezesekexexuke.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5dd354f17---92931544667.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/liwadolezifagazabudumu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4e306570---dapofoxuxomazekomujor.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/47011443300.pdfIn PDF document text
    • https://angkalaris.com/contents/files/panozojosilanomam.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/28555410782.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/notiwapebuvoxo.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/34039569094.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/24845012090.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///47364485878.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/pafatesaban.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/mujoxozugisijewonuku.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/24974372222.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-15/20210915154804652453.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8c619aa8db4ea324675beff856858830/94077796543.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/6263369470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+transfer+phone+data+to+pcPDF 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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 16168 bytes
SHA-256: be2944c8630b5477718e0c9510793ba1e375a57fda01d7b22734a3eceac71caa
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 10656 bytes
SHA-256: 4ea4e40ef67a9731d0b7eea7eb602247b0a5b9fac81e17692659e93d47299fde