Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea84e3339862c16…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 01:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce1236744761e9d1bbdb710a5691a3c8 SHA-1: 9cccaa0b9931051d3b7f2de4038b387961c26435 SHA-256: 3ea84e3339862c16392fbb946b714b96876ea50430f015b84e3ab971babdf0b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=impots+gouv+fr+application+android PDF link annotation
    • https://solidpractise.com/files/userfiles/file/41858334811.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/23590698153.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/21541615738.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/nakotovamosedosim.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202195_231222_847.pdfIn PDF document text
    • http://chinalabware.es/d/files/21966315500.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/9347940703.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/pojinobikuwago.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/91396038289.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/govobadojupesoleduxelagal.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/51054409739.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/7801914100.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/puzedesuvamap.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/fowileja.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/1625704812.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc35cf2836---tezatufixasiteki.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/kazimawewawezopasile.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/6041808848.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3d1eaae1---84453520865.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/rimeduva.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/51014307699.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/77265831365.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/dabokiwimixubaxisafufo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16139307d1cd66---vadaleweduwikaru.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/fabodukurul.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_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 18332 bytes
SHA-256: 974cda576ecdbb5f8a87c64a697c7d697a6a07bfb14d0560a3fc611a33c177de
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 10948 bytes
SHA-256: 15ec0542b2df9703380695b8034cd8cd131b9ccc56d222b146ee6619281c84a2
font_02_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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