Malicious PDF — malware analysis report

Static analysis result for SHA-256 041fbcbb13325a15…

MALICIOUS

PDF

84.8 KB Created: 2021-08-14 00:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a5a07580392c38b9319113f3058bf31 SHA-1: 3227a0ec559774e1b725951641552c58199db209 SHA-256: 041fbcbb13325a1578930e49834bde86cc01098c5dcb50eff5067f9a6c038917
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. The presence of embedded JavaScript, though not directly analyzed for malicious intent, combined with the link farm structure, suggests the document is designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4c941aa5a---71306499578.pdf In PDF document text
    • http://robwalker.net/fckupload/file/35133864429.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bobitaxobobew.pdfIn PDF document text
    • https://digireg.com/upload/jirorokapufovijusi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vasusejug.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f131784f50---84019797142.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/vijupukut.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a508c59605a---detevanezekel.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kabapukakudo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/46f54b495b084712f21240f36323acb9/56647860437.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vkmlle83tmrm8pphnbbthvu940/21974024279.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/2348157730.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/88387422705.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51267f6da---punesenukifas.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3cbdbe98737402a7d30a5c8ec738aa01/52767963692.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/tamexipototowo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797bce3e28---6039586075.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/5062148599.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b916653b5---58142623576.pdfIn PDF document text
    • http://plncse.hu/php_data/file/pomobit.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0tkjcra0ig5ud1e9g4kvp7s9f2/32693316532.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608333a3556c8---49202238929.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/zajunawuziwapunalunufen.pdfIn PDF document text
    • http://www.fotoliaIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mgr+old+tamil+song+remix+ringtone+downloadPDF 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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 17300 bytes
SHA-256: cf57264865cca591cd91852a083aa39959f27d3a06ab4e2b811c95b81b31afb4
font_01_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 10772 bytes
SHA-256: 6047babc0a67578af7556d4819ff5f414f3d76840491d0c2d87b3f562cae1a20
font_02_sfnt_off00012d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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