Malicious PDF — malware analysis report

Static analysis result for SHA-256 336f2eab02acdaeb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 07:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25de26bec7838f317eaa9f0dea584303 SHA-1: c0e134ef15c4c9a8e94247846b036271764d7e6f SHA-256: 336f2eab02acdaebad0f79f1b4cf86ca3c1849c149f488dd8a6ca2619aa72786
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to host a collection of links pointing to external resources, likely for phishing or malware delivery. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://myparrotfood.com/user_files/files/salilebujazizalojila.pdf In PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/poloxikerakatedepumow.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613249b29b9a6---luzed.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/21316517669.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/fusuzizewalulumo.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/pedusifodadegon.pdfIn PDF document text
    • http://haki.vn/uploads/files/zabakekeze.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/mojejewonodagevexowavaj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142ddbf9c1d3---31630231693.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/sitesisesimafegija.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/biwexufupiwalobe.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/869861f9796b7e1ef677d29dd49e03f2/lezaxanewigorib.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/migoxotolubesifukato.pdfIn PDF document text
    • http://airfa.it/userfiles/file/15973324002.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gakerudifeg.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/jukiwivugopivinova.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/20051754213.pdfIn PDF document text
    • https://e-midas.ro/files/file/bokesukiki.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/36445946436.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90559dc46---16737406724.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/26027074296.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139e981186a2---zejuzizupu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/21197816677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ppsspp+download+romPDF 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_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 10316 bytes
SHA-256: 99d64c5fbd5fa62346342e13b28ef48ade49ba7e41258dd26ef781695ae0c420
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 17220 bytes
SHA-256: 3f5c66ee2b1867a1ff78f4dad43763dc10c3582ce9752d63c0a5b8e4922674e2