Malicious PDF — malware analysis report

Static analysis result for SHA-256 452c22c2ccae258f…

MALICIOUS

PDF

75.4 KB Created: 2021-10-02 19:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0115ed580db804fd1defa2e353514ee8 SHA-1: 966b46e66fe4a3fab319142519da7927ed76a1f6 SHA-256: 452c22c2ccae258fdf4b6bea9c5eeaf83e75876f296184d6a2d61a74f993b359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate the PDF is designed as a link farm on disposable hosting, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=the+thousand+orcs PDF link annotation
    • http://nage-z.com/ckfinder/userfiles/files/85202803816.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/12621721555.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/sibul.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/44673975640.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/tafalajapawoniloz.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/26778391951.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/90907141413.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/53263371114.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bee89f1b8ed664c5b9731014ba5cd4fa/89724595224.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/rigapurerifuba.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/80197253550.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142f602a9de2---gopegororoxoro.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/93576340437.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210928144351.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/vodifujozajamuzemilebag.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/vogovog.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/28537393794.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/irlfdssdbkvsb34q9juu98fabm/xolatewa.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/diximogoxox.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/kobivorife.pdfIn PDF document text
    • http://livilgirls.com/files/13765403896.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/tofigobipuwugajebafipasi.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/42170197297.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_off0000bc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC96 10392 bytes
SHA-256: af175c1a90cbb89a763405460068f256e6b31ca1b8eef8a8abadaaa77f03707a
font_01_sfnt_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 19692 bytes
SHA-256: 9661b7e7bc38e07d24c3db59184ae57c430004dde3e5c8c0d26f1539c303f4d6
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1