Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbec552c4f30ec4…

MALICIOUS

PDF

191.0 KB Created: 2021-06-30 08:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b36d4572d89c6866f7b3989319bfc9a3 SHA-1: 753d0a10db8a8386575af47deb3a6d3d26afee96 SHA-256: fbbec552c4f30ec448168ac7f44a9a1428fb9bf45d263d66c62c1e91c800c82f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9148

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 http://fotografiafrancescosomma.com/userfiles/files/55068167475.pdf
    • http://cosmic-kino.ru/sadm_files/dulirixojisopisuligek.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/9f6b7dc92c8a480d0067b2d3ef832134/93357063759.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38b7ee296---38673617740.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75b484388a---latokeboso.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c753a0797---72248791493.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddf270d53---rufematoxojebiletuxej.pdf
    • http://sistersaviopublicschool.com/userfiles/file/fitirowififalalekel.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b17303d74c1---kibatupiwapexixone.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084ab39d3aeb---64778313876.pdf
    • http://amctop.com/board_data/editor_img/file/202106241801.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1d4c656aae6f6bf5c66ca1dfc60811f4/20774589211.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/831ec5e483992d1854b3db4dc896ded2/54915974553.pdf
    • http://surmounttravel.com/userfiles/files/xumazer.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c569f0bff---lituzofajo.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d72baad331f4892eed91548f2669171a/zomosalosajatugedibaperoz.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33484d5a0---30084536142.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec856af47---zalegos.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9c1eff8b033ee5edd18dc625d8014e4b/3908954813.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/sowowegex.pdf
    • http://canvangdientu.com/images/file/xetawifuli.pdf
    • http://parkwaywest1974.com/clients/861606/File/sizebikidezosunibep.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/44943414529.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jawamimuxelajivazifo.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cdc9f020---gidebomenojuvefogolufujir.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d498c7f979---10015855201.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608f66ac92e1f---90149900076.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=for+where+the+spirit+of+the+lord+is+there+is+liberty
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002665a.bin
1f5c03bbf41af81449cf32c00d5d0f593ba83df52fa9b155cda89bbd20e39eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2665A 10644 bytes
font_01_sfnt_off00027ea7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27EA7 16792 bytes
font_02_sfnt_off000296b8.bin
af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x296B8 16232 bytes
font_03_sfnt_off0002ac75.bin
db429d396e84f0cf48a108879f44bf545e5dd4f0cbd9405e567a1d42d3fd9a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC75 30168 bytes

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