Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea10e8fc10b47fb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 14:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1a35851595fd8be953f31b4209b04c7 SHA-1: e0b91f97060c917e24cc1e7cb542142a0fd41722 SHA-256: 2ea10e8fc10b47fb4d5a30c32c16fe6655dfa917850e1a750d584356cea4b9c8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple external URIs were extracted, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=fortnite+shadow+ruby+skin PDF link annotation
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/piguviwawif.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/xunoxosekumawifek.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/gukudez.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/navonigesedotoduxavan.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/junise.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/bigera.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410e938be5c---lavemojosesipukak.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/36f103e539bedddf8ec817b985bdcdb3/95829433207.pdfIn PDF document text
    • http://kunbot.com/upload/files/juwekuzupexedudasiruro.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fibobamaporozowe.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/rapofebora.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/vapitifozoturow.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/rojoxiku.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140816306901---60847791037.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903120123160.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/51796239248.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090901460954.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/17132844615.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/8513389420.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sunonozutade.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/domejofunezu.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/movinukek.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/53857164387.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109091933391001.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 18828 bytes
SHA-256: 03760958aeb359855040e0cefd05bd153e259cbf77d2d082b594ece2413e2178
font_02_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 10808 bytes
SHA-256: 5546ff877618fff1601d3f0189cf2ed709f54985bc5415ff80a052dae25778e6

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