Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a331cd1b8d9c377…

MALICIOUS

PDF

76.1 KB Created: 2021-09-24 00:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2731a97343f9d2eda92be85ba01e7be5 SHA-1: d0950b9dea553e909ca1e0f60ded21e0ee0a532c SHA-256: 1a331cd1b8d9c37774bfb45beab083b648e2f5ea64c1980a3d077523fafaba47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely to download further malware. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://tradingcall.in/ckfinder/userfiles/files/tumebawavafut.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613df48c12575---91795485033.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/rudivozuzedubofesupoxor.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135b32543a67---miroladasokiwegimijatal.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/sokutisovabirom.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/dolivewiniwilafe.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xexibigonuxavopab.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff71884421---kafimapebazabuwixibifo.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/xosadamiwerulunapa.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/rofopepudivevadi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u65e349rjtuaglgfcoang36oau/joresivibetazezana.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/79056055748.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/94116803797.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/mobekebabepiz.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/14209535604.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pasowokotaxokelekexalano.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/17248394118.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/getovusimamaraxoxuzog.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109191146441087.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/31a7d72f3332075308d52e38da2068aa/65955783581.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/57958197548.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b181ac631b562fbc4fbd3e23e14699e5/96335946369.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kisuzu.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/dulixow.pdfIn PDF document text
    • https://sino-islam.com/upload/file/210635279836.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/rutekodikuki.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/1fd423042cfbf983387677ee61b8f30c/4264718702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+the+app+storePDF link annotation
    • 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_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 18564 bytes
SHA-256: 4bc133a1bbe554728750653682e431b2b8b0d88b3b664bb617c6bccf3bb2d07d
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 10484 bytes
SHA-256: ebb09ed00c6ee8da6cd0b114ab71d1717de2c97c3daa90942f99484e4d42677e

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