Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d8adbe21bf05f7…

MALICIOUS

PDF

78.4 KB Created: 2021-08-26 20:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 531a84a891d662163a57a0f806f9820e SHA-1: dd03b2f2f04b847b15a724f29577bae806e1a59d SHA-256: 82d8adbe21bf05f7b8fd9651103808828975db39172a0fb9fa30a76b36f70830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=archdiocese+of+madurai PDF link annotation
    • http://fleshlight-tw.com/userfiles/file/vibulumekoxatezot.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/93202682737.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/n1dpf6radpfuluj4nq6a7rs3qh/maxugiweb.pdfIn PDF document text
    • http://ahchala.com/img/file/92071397537.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e842e0f4---54839620474.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/aef919fbaf9fa8afbfaecac6137a7de8/71792945216.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/388irh0m5vl0k7kqk3evqo6un6/rilesukepolesup.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/d1dcd43a59fd2ba2480f2db59f671764/xaxuxosulabidevo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d05735c75d8f4ac9016f01ef975947f1/zevekusidozemibisofizi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb55439f741---lamemomivagemuremaziloma.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fakevaleve.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a84bde01f---fuwojofokebopebu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1ebba8e2ebece31a3f287702cc176f37/67099649109.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/76259824004.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/38074222542.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/batow.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38add00ebc9ffeac488e340ff90b6552/xiregikigesarofutoxepig.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/xorexepifovitigidewuj.pdfIn PDF document text
    • https://bem-sa.com/img/file/xoxafowizesoxexawalen.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/tubetisojaf.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248fbc2d89---67998487871.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7f04cb85---39407327328.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/kageganak.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048a0dd9337---tazeg.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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 16720 bytes
SHA-256: 60360488e906c31b6e10965bda6ddfc102dbedf9f40b235ce0fbda221d16d270
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 10572 bytes
SHA-256: a9e95b616ad6802e7659734081dec93d8e2cc6c2b341f5f7a3aeeda1cb79ccb2
font_02_sfnt_off00011346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1