Malicious PDF — malware analysis report

Static analysis result for SHA-256 063b2330bbf7a888…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 04:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1c261c7ff6def308be0ecd04a1de371 SHA-1: 8c45c130ba89bc26fa88428a6c297adbaf7ae932 SHA-256: 063b2330bbf7a888e85820043187cc2fd80554b204c64225a7f36b65f9da7ab1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious files or conduct phishing. The presence of embedded JavaScript indicates an intent to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://oniceh.ru/uplcv?utm_term=isaac+paid+tithes PDF link annotation
    • http://statewideroadservices.com/clients/879378/File/15675662043.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856696bed0f---72929023023.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/19441028769.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/lifelumukaduzirividemiro.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/63986210321.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/94201658257.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29301e4e4e---17075518365.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jevukiradaxupizisuto.pdfIn PDF document text
    • https://patc.fr/imagesfile/vuximugozurumironumu.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/zebuwetuti.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/30634453608.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/47856163306.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5a7qdvpjqmjtscthq6prgkt631/wunokafumeno.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/bidamisopujimej.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/negigeserudugojatetibub.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jakadopexofosarizikedozum.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6290960512e8c4a2a5dd03c3064c7659/bojademebuzexerodozadugol.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/nugevezabeveveno.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/povonubu.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/sisosenalunumakofuw.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6d27deccb757196a908a240acc708560/95762396338.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4ef628d62---mujubapebutefafi.pdfIn PDF document text
    • http://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/lofabulebuxuvugis.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/kubaroxeb.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/xogeli.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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 17264 bytes
SHA-256: 01184a4abe5f7870a35108fbc888796f480c8908d49ff24c1836fe8c59918caa
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 10192 bytes
SHA-256: 5df5d48a1f22c61109d0821856f96c64098b341c7213c34e35a81a255a5cfe7a
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1