Malicious PDF — malware analysis report

Static analysis result for SHA-256 2828f63272d6f9e3…

MALICIOUS

PDF

86.2 KB Created: 2021-08-29 16:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f1ea11f3e9cc19feac0ef50dc3247c8c SHA-1: 9d3ea86ce09c209439e5d4716eb65fb381c5ce15 SHA-256: 2828f63272d6f9e3adcaebfa74a915381f5e650bf3a15fec66a0c9928f1714ba
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=best+technomancer+build+outriders PDF link annotation
    • http://panda-es.tokyo/yamituki-n/uploads/files/vepovokasawujagava.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea7dc8a66---faxezekuwajubav.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b85371f6f---61166323977.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/vupinukilupo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vutekure.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/zedudekorozusixite.pdfIn PDF document text
    • https://maria-galland.ru/files/file/52178915074.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/76895815122.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cc9dcfe2---92995293333.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/18197350602.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/64966646633.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807aa9a37df---15161950582.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/478381cbc83dd7ca9014a2e8e75e8f72/wojajutenizofamalejasesu.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/91077125986.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1lph5mhhtdjd80the5md0o3vip/21342293189.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/pigeval.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2b2f2d9b---kizij.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3db256ioboucmmvvpcg50h76nc/merogajefabanikifuta.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/638ac2b801e2fbf6b68c7b2742686d20/62380113512.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/524bb0e8bca7dc4134069ca6ec47527d/45724593497.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1161581551a44d1679a570f707a78842/58279670252.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/49ldme0pa48mts25hnhgpn5686/wixelagasisiwigukefatuwer.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9493a69c930a00c758347486135058a2/pudamomozatob.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758c5fb8a35---69449878015.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_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 16800 bytes
SHA-256: ff2dd24523d58d14fcd99f7d747ebcc75389f4281d648e600380a04090735045
font_01_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 10928 bytes
SHA-256: 0951b960abaceb24b17f674ef53a6973a2f2a96cd5ab6a4a8d303076fc058909
font_02_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1