Malicious PDF — malware analysis report

Static analysis result for SHA-256 97de65135ef179e1…

MALICIOUS

PDF

86.1 KB Created: 2021-07-04 00:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2c642fe0db501afd2529488cf3f334e SHA-1: ba829ace6e0de1c4c1a4e724500d270f65fb27be SHA-256: 97de65135ef179e1c247bdedcb4febf4d22ca523dc8083f9538017a7e3d7587f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=after+life+movie+stream+online
    • https://kovosluzba-praha.cz/res/file/25236569696.pdf
    • http://amdind.com/userfiles/file/60986289950.pdf
    • http://polish-house.com/uploades/fckeditorfile/zesone.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7c9df86c---vufudugazozubuf.pdf
    • https://shopabrang.com/images/files/39040560917.pdf
    • https://atraba-holding.com/userfiles/file/ladimurewosoladoxi.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0cfc042d2ff7bd13f876ef89d7270102/93905759089.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/42827030870.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b735682b8cdfca0ea04bb8828c8de6fa/74365066090.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/fkp8ipmj1erkbj8coj75376bi7/29720091662.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f4563c6ae64436f0087edb54ea68dcee/wonaxuvasox.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/42abeae614f49e844727c6efdab5be87/wuxefimepolan.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/921e9169764380f63027d9a38637b2a0/mazosaretifawololer.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/acb12b582b15013628b61b0bfa591ba3/bedixofuva.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e812798e7---kimilugebiruzi.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6297b0e2c---79386825114.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/52034e16a5a30b737af01b7fa41bedd4/tixezofavifelepowur.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924f16f1a2b---11076446524.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/sodajere.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8baef3cb---91571906890.pdf
    • http://kompletucetnictvi.cz/files/file/zifawitawexitepu.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607455c14d649---77040872255.pdf
    • http://medlab.webd.pl/upload/file/gojamovejobinisorovutovef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef1.bin
f2d225d97f944ff54f2eb1063af561250211edad67f8b8f94f71c4681b8124cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 10420 bytes
font_01_sfnt_off00010695.bin
9bf86cc1d7c0991b6badda161082546e6440632bc6663179e11bb934a349ee1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 17144 bytes
font_02_sfnt_off00013328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 16792 bytes