Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd20fc35f50502b…

MALICIOUS

PDF

101.0 KB Created: 2021-07-08 08:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ac3fecd8fda8be9a55fd93c5d41493d SHA-1: 844ffba70c68dd42d4f16694b490ca932ffb81d9 SHA-256: bfd20fc35f50502b3773551dc53910266ac1bdef7f8fcc71c7cc7545b6cd7f24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8ff63f10fdc3e9feccbe9b151395d22d/pokovemitugulogeluriti.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3e84f2dd80112e1f55aa58665fba7e46/viximivugisatigarinitikuv.pdf
    • http://speed-r.com/js/upload/files/dimofipupamomafekifikag.pdf
    • http://hondasushi.com/uploads/files/34119590469.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5bc3d640---sosojukujutidorurutu.pdf
    • http://timnhanhonline.vn/upload/files/9153694645.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae75e5b9a1e---4467302005.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/59459fa4d37c241bf4530d2a4f43b11a/67455033801.pdf
    • http://saovietgroup.com/upload/FCK/file/motetozaniduruboxovizevo.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e09bba59e30c9e5c60a6be0facc84e57/38027562788.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc717cc9dcb---gosufu.pdf
    • http://debeleven.net/UserFiles/File/16323109755.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5qdj6qhgvmisjdhbf7v6m4tfs5/25170936012.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bde24a3ccdb47a119b8469a519cbb673/69259760041.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad895c6080b---69898431754.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160add9d53ac1a---70516572286.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88ed4df0d---guzokumotinanuzipeb.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/95801731885.pdf
    • https://tempatpasang.com/contents//files/29287791390.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607916cdb23a0---13724418568.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/jitodizekebolukogiruv.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2431e2f6e---fifevabetuj.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b41a7208eb4---34380672074.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dead+or+alive+xtreme+venus+vacation+r18
    • 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_off0001170d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 16792 bytes
font_01_sfnt_off00012f24.bin
d2e669279b9ee06b153503b94aeae8ed4ae9ca4749077e9887d463fcaaa65300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 11060 bytes
font_02_sfnt_off000148eb.bin
bc294cac966101ded9b6aa628747cb4bc87d29a20e254c62724c4f8cfd678b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148EB 17464 bytes
font_03_sfnt_off0001759b.bin
bca2947dd9d45fc0ad5389fdf95230aabeca331873e8d7f19719f51e15201207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1759B 3776 bytes

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