Malicious PDF — malware analysis report

Static analysis result for SHA-256 930cee3d940da376…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 20:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 086e11ee819a8ea7d6a4bfb779a16253 SHA-1: ece348372f2b50e968e111fdf387225ff49de199 SHA-256: 930cee3d940da3762013a67a97a26e8ed70730c24a0dc0850178dbdbfa3d4d6d
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=ugc+net+answer+key+june+2019+pdf PDF link annotation
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/bekonotububaveraduke.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/rosabazavizetoko.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b48d5099370---nixuw.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/45298288700.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/luvaridujogosutomogi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/23402694221.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/74713542088.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc45ac378---kepimuripegotisiw.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16104652decc6c---zanavifiwide.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f0cf716de8d3f7db47b7a77540845852/vivunebowi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37f2267346---bunajaf.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gegekozubaxidafujoz.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e77948b0---jejewotorizidu.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/nozumiralew.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/5i9g00vrm9t28e7mj86l0ff8al/pogodomaziluzajuwuka.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/8912684094.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/93809587728.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/51320701301.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b8fe8bdf3c57fe3b68c5310d38aa06c4/66788042923.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/82733639164.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/gobikevawuzemo.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/61911987012.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4e5ab0023---44494866635.pdfIn PDF document text
    • https://wildnaturetravel.com/File/mopiseri.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_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 11528 bytes
SHA-256: b2b5fb3201d0e414dfcbeb5ebdc90b249e47d8f416b15b6bfa58d5a0a55cbe73
font_02_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 19276 bytes
SHA-256: c699e7f963e743f0d2b5308c53b3f671a08c350cad231baa71fc7df8dd82fc6e

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