Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc5eba6c8fc3ccd…

MALICIOUS

PDF

68.8 KB Created: 2021-09-02 06:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c527e0e451aa6abd1b9eb802ef0bc53 SHA-1: 1100dc5cca388dfb6a3002aa3f4ad889bc746f31 SHA-256: 8cc5eba6c8fc3ccdc9cc5559bca98aa1550764e30f9a65dd083b8ccbb9275060
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a phishing lure, presenting a full-page image with a clickable link. The document body is heavily obfuscated, but the presence of multiple external URIs, many hosted on compromised WordPress sites, strongly suggests an attempt to redirect the user to malicious content or initiate a download. The embedded JavaScript likely facilitates this redirection or payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krisoc.ru/uplcv?utm_term=coffee+and+depression PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/acr079ip0sgj3bk3qn82r632c0/wanarogupekow.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/vujawinuvolo.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wezoxuvekironenasasiv.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/42860270834.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/90748787573.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b9333ebde---42462236052.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/bd38118651a2aab5e1269f31242c33c8/vefaka.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sifotiwol.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/zifizejowuwak.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2456cdfa---29461303931.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/43958985851.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/44647720504.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/23720142322.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/j2d0aeuupeko2l3u8qjjrng37s/20253009468.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e6e32da5---zivuluwefetonexes.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/96858169163.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb6aa3a87---sirudi.pdfIn PDF document text
    • http://solo-enoant.com/content/files/files/91787372456.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/dizuzejigavimosafupuwumi.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nogesulipafezami.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/sapozosak.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/zubunuvezamuj.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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 13724 bytes
SHA-256: 36bf76810650cf5f4180ede273a9d105be7f98e8655efe98a44640de6abc8e8f
font_01_sfnt_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 10376 bytes
SHA-256: 08b404096d3a7897c02b4f2c222df81138abf7c1f70d32849368c21bbfe58ad9
font_02_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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