Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c879ae0c2bad642…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 15:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1123ad837c64ef2c597ae9ba18c4c266 SHA-1: 56af0583eebed1fd0efc6a48dd9b3beebf74a47b SHA-256: 9c879ae0c2bad64295515846a2f846fc686286515738d34f40afc3f4561a912a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=gta+sa+max+lung+capacity+cheat PDF link annotation
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4ukssi0lqtf6ei7ogrgg4gfsm0/zafevisotigeleb.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/tivavipepukepujake.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/josiniwumevabi.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/kiwemabe.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/74448006017.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/voxetinarupovun.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090111120532.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/33805523293.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/98411090759.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/vibunugekanamerisineso.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/52845509633.pdfPDF link annotation
    • http://koyomisushi.com/uploads/files/72200474462.pdfIn PDF document text
    • http://aven.su/userfiles/file/zizizakajarosexabave.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/dodukevexezem.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/rogeligidozibazojef.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/wijovixesofizaj.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/84476087655.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6014c481f---xiwevavewaz.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/52696225318.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613632a6ea23b---40651826684.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/surolaragegexisa.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/xegoxivaburoxobeluze.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/1604175086.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/vupexubebu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/564sj0q9rids3t07u10dmdjd86/jirita.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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 17680 bytes
SHA-256: 407c5000c63f703d31211dc11c0bf074d51a67adcff59e387ec803af435bc0b6
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 10956 bytes
SHA-256: 398f3acc64d47b59e1663a4664a72943028ff71fc41d00ca899734c0c92815ed
font_02_sfnt_off00012aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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