Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c175d74c5900cc3…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 09:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72336141b1622bcb480545265a77c8ea SHA-1: ba36ab91c098abdb03fb14037eee1c8eac760f6b SHA-256: 8c175d74c5900cc3a9b532836d57915fd4d10a4f148064b8b23d0005d3c51632
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://galerie-louise.be/userfiles/files/bezemetavoz.pdf In PDF document text
    • https://isosklo.cz./uploads/87185949275.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dilunoxezufevatakiziveru.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/tupexezowaxibe.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/43764209955.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/jenowalutopobimatu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/sijezajivobemav.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/beliloz.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/talelo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/muraropiwen.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ju0fudafsfjis918605fg56tn/betajebugipopivipozi.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/54503015419.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/67bda468208d3ac3674af099147ba462/95898771960.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e471c80c5c---rumoditobizowuxa.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/miruripumakifisorez.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/gipovamukedujijoribe.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e971fdb485f44236d730b9af8206adb7/xibisusodet.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/kajazenatigu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c81e5548050abe3057667dd91cf04607/20661086664.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0ab7af353---628052388.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9qfdlc2r34plm9i56mqigjpeim/bizawanubapad.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/72076806495.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072bad33587c---fibozapudemafuwokikivar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+long+does+it+take+to+prepare+a+prenupPDF 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_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 10836 bytes
SHA-256: 3866de627cbb9af8161e31b7b66b32694cec7980bc5eba52f2992d9d363fb8b3
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 16240 bytes
SHA-256: a80ec3e45d88ffad398c6c42fbb674985b430e212bcd01788a4352fdfd4e0b62