Malicious PDF — malware analysis report

Static analysis result for SHA-256 1056ced2fb99e359…

MALICIOUS

PDF

89.0 KB Created: 2021-07-19 07:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d28c7151fcc03f1692b1354df65a39f SHA-1: 852c1897d74ba2084030560f2938ce5713330672 SHA-256: 1056ced2fb99e359132d971e9cefaa525cec733db88574c63bec0f1751e02773
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress uploads and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://nt-module.ru/ckfinder/userfiles/files/18507597934.pdf In PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nawanadakugegaraloge.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7da77ebef5---52179922036.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/39573544980.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/9095358367.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/gelujol.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/39eb23f2163e3c40e331fc820f01b292/13473721250.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/1fce0f69e72add897ee4d573493694c7/4493693166.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ps9pbohb80m38k4mrqdqrbtrla/fimalejurisa.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/gedajefusoguwepomejafin.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/62349150849.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/tujozofijewimuji.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/sexevegibezopak.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522023201450930.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/kixadulimulivanowif.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c709b63b8cd---46974615103.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00cafb5628---22722964964.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/88088175339.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e6d9e6398d48c418f7bf68118f0628ed/38517300440.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/112fa79d7b930ce502cbd94b88f17303/70726486597.pdfIn PDF document text
    • http://sakem.org/userfiles/files/pelipuzer.pdfIn PDF document text
    • http://huimao.com/upload/fubimu.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/zififav.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3kiq0j2qodmfj2nujq619t20rc/lisutamaguv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782d4f2f14---tuvaleran.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/05a68dc9e3675c7e735f9d221b19d230/20440379834.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6d21c280---xorazojod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=summation+example+problemsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 17216 bytes
SHA-256: 84d9bc132542a76f7067f71df05672ffb90a14c7ecf17e8b1934ded7aa90cba2
font_02_sfnt_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 10828 bytes
SHA-256: 3570fcd63c3a582ab98cfc0cae366b414798b12b1b67caf99d2eed4b27aa4bca
font_03_sfnt_off00013f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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