Malicious PDF — malware analysis report

Static analysis result for SHA-256 89efbd9a4893ac87…

MALICIOUS

PDF

115.2 KB Created: 2021-08-03 02:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ce820db385e49a052b1094a237d7222 SHA-1: c3ca8bcf20deb731b0984a408b6a67da13f75171 SHA-256: 89efbd9a4893ac879f86d1b17d220a0e9f7f7b7bdfe52fb1becaee11dbc5c323
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link aggregation strategy.

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://smidgel.ru/uplcv?utm_term=kutty+movies+2019+tamil+movies PDF link annotation
    • https://carsen.sk/editor_uploads/system/files/71870047249.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/38295679772.pdfIn PDF document text
    • http://pvvc.cz/files/44131612772.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/g3cj2mcqs90uv1r0gq85btid86/44287844944.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/47455640071.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/72531466233.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093e92deac01---60409397187.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/29935878214.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/47340795384.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/zuluripujozovelobur.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/36067708720.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8c98a9bc---68965962821.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43b04f3a7---rikerulomokexiwizelu.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/mavakerowagaz.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e7a13420e5cc6e85111f6ba5b6b91709/jazosip.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/790ebdcc9f17b2f990d95ae87313a99c/76017777604.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7c5b3dce2b9abd9602e0e4f148c244ba/3557512048.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a1b2f63f---jemeserekidodixogofive.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608481b2417e4---negamojimejomi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607241c7e9c3c---navabejaxemixum.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3854857b0f93b4be57be465b2358c5cb/31957428384.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/depajuxikaxif.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/46729640997.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_off00015ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED7 10800 bytes
SHA-256: 1d623da70ff654a1db70cfef4e5ff27e3f1b0946df025aed58831b2f4494d677
font_01_sfnt_off000177f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19003 17820 bytes
SHA-256: fe89fbb0faed260d0319ba9c0871a0961e39e96fd4b7ef8be1809254610828f5

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