Malicious PDF — malware analysis report

Static analysis result for SHA-256 4253e1d905523092…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 05:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8ee3d913967164615b4b4cf897a93a8 SHA-1: 9c346fbbd01efd948ffb61d49552622a0e4730b6 SHA-256: 4253e1d905523092f7b03f43c8204dbefad8afac35b5de69eb3cc3472c72999a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's intent to trick the user into installing malicious software disguised as a browser update or extension. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smidgel.ru/uplcv?utm_term=download+wattpad+versi+8.45+0 PDF link annotation
    • http://grandrosso.com/js/upload/files/gejazumus.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/91234599498.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/xupujosovejexek.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/rebepu.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/togapatuver.pdfIn PDF document text
    • http://ropesadventure.com/d/files/taran.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/42653126375.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/34428404973.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/90660199816.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/76562244295.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/ganowojixojofiwekabujir.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e37f0436---fogasonog.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/bubelamonojaxonu.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/16292272110.pdfIn PDF document text
    • https://intersat.lv/files/file/fotivadosujidimizomu.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wedajupulozokajarizunof.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322deecfe96---wutaxa.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a20c6dafb195d873d792b938cb333235/13360895431.pdfIn PDF document text
    • http://pb-book.com/user_file/file/79863687051.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/83707091814.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210903_201011.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/53273742588.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/62327540930.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_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 17420 bytes
SHA-256: a771dfcf656c275f4f55c60f5722958b1b3afdc62a638b42b92f33bbc8c644b9
font_01_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 11144 bytes
SHA-256: 15bbc9494da18a7bffa71616be2f0b404c0b86f64609e1fc47f6c28ca1e8824b

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