Malicious PDF — malware analysis report

Static analysis result for SHA-256 d475b66529aaff9c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 22:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f02576490b37a4b0cc0c15978beae567 SHA-1: 90995d2b47b9f35ac0c126143bff7f3661e7e7b9 SHA-256: d475b66529aaff9cc90d966b99f46254ac3e03910d436808dabaff62d7ae78ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm structure, with multiple URLs pointing to compromised or disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=luxurious+live+wallpaper+diamond PDF link annotation
    • http://progettogeometra.it/userfiles/files/39590877762.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/43711119300.pdfIn PDF document text
    • http://hla.vn/upload/files/63118765534.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/66f2484437a7f40cf3bedf01ef80696f/zojisetojazur.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/61044446503.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/16611190507.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/pebum.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109102308069002.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/78335902069.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/b757ef.pdfIn PDF document text
    • http://hk-keber.de/images/file/4034261461.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/pifesusad.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50f1401e7---2386331057.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-6/20210906072150396720.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a653cbe9e---zifupagemedizu.pdfIn PDF document text
    • http://tulga.ru/editor/files/59131595465.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/53321152064.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/59392169150.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/11767324734.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/14915597619.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/86433174885.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/fewesive.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/38699709322.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 10768 bytes
SHA-256: 7c96c36dee0b682f268d31be5c40f337c33e8293d3c06c53aeaf260cbf551bad
font_01_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 17540 bytes
SHA-256: 740ebc4e36d8f9bafe95ee02035dc7117a0b94fe236336ca1186fb75d4a089a0
font_02_sfnt_off000131ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1