Malicious PDF — malware analysis report

Static analysis result for SHA-256 846b284d925baed1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 13:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47c37ce3e77e187be8ac7a7df579ec14 SHA-1: 3c9b5a4a22adee4faaaaedbb9278b6a0250cc66d SHA-256: 846b284d925baed16d5b173619db7283eb59aafe412b328acdc82f49c618762d
164 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 are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=soccer+free+streaming+sites PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kutot56jd0qm58mvg1e9n8tns5/93941637110.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/57751321311.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/baromomafa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468814a6afa---74299852913.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/8475659565.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/52342093760.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630922572emK3.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/gujide.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/31653521580.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/popuzaxozikivopulezebemo.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/90551784291.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109011338404679.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-19/20210919190408158197.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/bezamubam.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/76666961791.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/nosisolomadigilawejemed.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/vitamuzatimovonuwawu.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/tazewubavopikozazakorak.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/19010979557.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/kidivuzeluvedax.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/vagizisawup.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe496253a5---nawibijerabonuwokafi.pdfIn PDF document text
    • http://juncheng.tw/upload/files/tubapaxurepulibuw.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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10708 bytes
SHA-256: e130de4f7fb04a5a342b6db40b8f44a58680c619657664ce58685e917b781826
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 17704 bytes
SHA-256: cc326f55602975754c3aa851e7d39e2a27c5773c65643b3af81b8fe3647f9d6c
font_02_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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