Malicious PDF — malware analysis report

Static analysis result for SHA-256 c601c6fe915e6412…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 21:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53e21deaa1c375ebae6956556486d3a6 SHA-1: f8eb61d46b185fbb60fee892d97eda6f20380abd SHA-256: c601c6fe915e6412e1eb4ee69f9dc31113400c5e066297fddcba48163732ab2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=modern+compressible+flow+with+historical+perspective+3rd+edition+pdf PDF link annotation
    • http://universalthailand.com/images/uploads/ckfinder/files/60842070677.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131daa6b7ce9---fisuxobanikaxu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1b6c801e9358769242d60998c48c4fe7/buwagi.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/55834839845.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/82189485840.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbc1e713c---68251402247.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c341a210e2---91034165695.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/xegodagu.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/domenatubedajedepiv.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/mopirol.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/dokoditenaroxuru.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109051028583365.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/45948652422.pdfIn PDF document text
    • http://vpsystem.com/files/fck/73950322922.pdfIn PDF document text
    • http://yibetter.com/data/files/nesefaruvifozotuxarexokol.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/34816634186.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/25047997997.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/64691063752.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/rulosusujaxomop.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/dagisexor.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/76381423822.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612f066e1a6cd---87497534282.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/purefoxoj.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/nakarusakebezopomixi.pdfIn PDF document text
    • 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_off0000b14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14E 11344 bytes
SHA-256: 2ae10292480479169c878c0d39632667bb8560657f7671d4e675c166654f3fd2
font_01_sfnt_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 14856 bytes
SHA-256: 8cdf76f7c1fad1e5f96380c1d868c4c74708da8bee776ff23b08e19f2b09f589

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