Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43c19c640fca03a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 18:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ec0ad96b43188cc8cf454bfd94dd4ad SHA-1: 9cc3ab6c2c23d25217312cd6850c537f0ebcb3fd SHA-256: f43c19c640fca03ad17e7d0551480e1a5069a0b5a3f6898cfd53b93ff7c8ed52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=juego+del+chavo+del+8+para+android PDF link annotation
    • http://suachuaspa.com/upload/images-content/files/taxiganolarewu.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/31097445626.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/maduwanamenej.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1dbf78c24709db129cbd15247e54f741/24130052337.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/3401294825.pdfIn PDF document text
    • https://harom.ro/files/file/81301294746.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/paruzegopoduvowokirabelin.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/gowubotoroguvet.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60853447073.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/bawimitusen.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/68213964232.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/7175834131.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/77550550536.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/giliwasamifabazigufedag.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/sekidupuxovi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/xivukov.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/datusaridubukovuninuz.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/paninusafonenejona.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fd85efd8.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/zozirufakixasora.pdfIn PDF document text
    • http://rvhifi.cz/files/file/6663508307.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/95827889632.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/fogemi.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/87285321332.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/bawikufumido.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2f234e5e88b01b2759f59371e8a3e660/36582691120.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_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 19892 bytes
SHA-256: 2cf2f48db6e4cb46affc4b481d323c092be92bf89fef6b9863afea6cd4834858
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 10892 bytes
SHA-256: 224556793be5a0b2223dc759b841be6eaa75c7dff263378a95e16c4e8708a00b
font_02_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1