Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20e8caec8aa50a7…

MALICIOUS

PDF

86.3 KB Created: 2021-10-08 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bb12669ef6854e6e4b9c6ac3bcbe72d3 SHA-1: 3ef953e393f2230305eb3066f87c46794799d007 SHA-256: d20e8caec8aa50a7c08ae3c744f4a882a32a4c2660f875ec534b05935c20492e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware, aligning with spearphishing attachment tactics.

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://drafthe.ru/uplcv?utm_term=basic+computer+hardware+and+networking+notes+pdf PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/pp2bel7k57rgvne9ibhnq381ou/26763437397.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/56924883999.pdfIn PDF document text
    • https://stormester.no/files/file/72768281772.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140420a038d0---najisiwurotifufa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614404678e823---42050824020.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/646053384.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20211006145431_j4rrwv.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/desonapiva.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/fuvuxorirovawafizasasenil.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/77228691704.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/49360268098.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/42805184233.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/210003569490.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/lewaranuloti.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/86834655404.pdfIn PDF document text
    • http://perksys.com/userfiles/file/22994594497.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/93702090174.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/58812846083.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202110052123302537.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/45197025047.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/punororigejakode.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rumiji.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/lufiwedemotagaworoxiwe.pdfIn PDF document text
    • 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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 19756 bytes
SHA-256: 0deb5eb31c8d55927e18c6d3cf2fc92172213f51ca9268902baff872babcaf87
font_02_sfnt_off0001302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302D 11352 bytes
SHA-256: 863c1dbc8f529818cb55a89ca667f45206a50ffef4962bf86bcaa97960676f8e