Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68b0424255f48ad…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 13:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05629ce9734f17db76ab489b07d6a9e0 SHA-1: c0b6fbd42689c04c5165fd5b12da9d9af215457f SHA-256: d68b0424255f48ad74856055af1a49118595ab2acfbb2531d8164cfa54cc7aa2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kmkmekanik.com/upload/ckfinder/files/luparopogugarufalusefipe.pdf In PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/turarite.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/40706134805.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/wivefiwujovodak.pdfIn PDF document text
    • http://zerosquareonline.com/file/buwelebupuzuzosare.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5fb227e8---mutegagugafetarexanoka.pdfIn PDF document text
    • http://espokebar.com/uploads/files/80422584542.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/zamef.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63802665041.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ba749835---63483770292.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/linigorepomema.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/xerixoxubuveme.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e637fe856f---degaxebelabubagogip.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109081620044864.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090712194873499.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/gipadeso.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/85439806397.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4deccd97cf4dc118ea6efb458905dd5b/84389616328.pdfIn PDF document text
    • http://scarpatti.com/files/73709663214.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16142896c5dab1---pasozapekuzisalanuse.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613377f755ba6---8620282778.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/doxakuvulotavotifegaki.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142206c848f4---62907622155.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/98586212623.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/12040838554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mad+max+nesPDF 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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10048 bytes
SHA-256: ec96258a537aed5ee8675b19a5ec423e4ccac18d430c76e15a945295a0af5e4f
font_02_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 18320 bytes
SHA-256: d80be49056b2b6b0347068b65da1d6e9bb737667b9438bcb4d88d80c4f85183a