Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c85a782c1d795f8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 11:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a27528ee210b37f5e58ad3a3cf0d24a7 SHA-1: 89b4c7130b9b010fbe0b1f04b2741dea0b42a8d0 SHA-256: 3c85a782c1d795f8c3a3b4ba19be233e162613b1b90510b635f7ae516b7476ae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. 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 0.9955

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://coretry.ru/uplcv?utm_term=sun+direct+remote+app+download PDF link annotation
    • https://retrofitoman.com/ckfinder/userfiles/files/63469239974.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/xotogigitef.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/pijatobazuzavexili.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/lopunemi.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/96594429984.pdfIn PDF document text
    • http://ladna.pl/user_images/file/21332917410.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/zabigowuja.pdfIn PDF document text
    • https://gulamanis.com/contents/files/88515719656.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28828966097.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57bf15c1f4677f8d6dd82788b106bf2e/zakatugowa.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/86865261690.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/acc0kd4n3sh5u98nsvikhg43ud/zadak.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/teziwabidowesutazudodob.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16133dff169123---15135917287.pdfIn PDF document text
    • http://www.centralperdana.com/file/6566106034.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t7vgbcpncj4r8lvr78ht0k2slb/sibizozefefafazi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/70414671467.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/nudufopot.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/roweber.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/poxevi.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/87843421796.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/giserokasifaji.pdfIn PDF document text
    • https://ms02bet.com/contents/files/43361763912.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/watavavawimukesobuwisa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 18160 bytes
SHA-256: 02922aaf037a2e1baa6855d9b7e353f0fede12b0ea777bb42fcb8eedac0c92dd
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 10768 bytes
SHA-256: 21f269b662432096c9af2651ea8853117af94550de977f8aba658dae270db2d8
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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