Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c53cbdca33fd5d0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 05:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2bafa90f3e5cc8684fcd1cda4c3f3750 SHA-1: 2cf6ea55945861e036baba3911a6d9ee1fc77e61 SHA-256: 4c53cbdca33fd5d0b0c1500d90fefe2fb049d87e0d7be50fb2a9d528a217ebd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://habibitours.org/ckfinder/userfiles/files/90896972159.pdf In PDF document text
    • http://zzquansu.cn/d/files/61080341576.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/4645769514.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/widapojigoteg.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/1167843598.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/534d9fe3a413aebae428b139a39dbd3f/61840372437.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/48075218768.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210912163147019565.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/viwofinapo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b4a6ae96---7430718993.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/nujaza.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/fevosoto.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/49175266219.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/kudopef.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/fatufanedonatadedetid.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/gefesukanawased.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9b731d98---vilobakobonozivis.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffba8cfa7---jafijobimufiru.pdfIn PDF document text
    • https://kvzriu.org/images/file/55527816832.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/37772433701.pdfIn PDF document text
    • http://szwygs.com/upload/59376655452.pdfIn PDF document text
    • http://zenkatsu.dk/files/50870888403.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/wavateladuparobes.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146971c1b121---86553617044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=diablo+immortal+apk+2021PDF 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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 17184 bytes
SHA-256: a1bb9868efbccf3833bec0d4c467cbce19288272789ee2ea85282eb239541bda
font_01_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 10536 bytes
SHA-256: 22d3b2e860ac521b9ea5290f76075d3c643dc4ae53d78908c8d9d8712faf3673