Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0955a66ba9b26ca…

MALICIOUS

PDF

76.5 KB Created: 2021-09-22 10:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 348a9e5189214d24378b2b6c350e3e39 SHA-1: 89a7ef34b5cb1af3fa86cb05c3c613649fdb49ad SHA-256: e0955a66ba9b26ca15840424e6df7acf4f1b7a8724a169b2e0fdeaf4eaebcf3f
164 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting an attempt to trick users into downloading further malware. The presence of a 'download button' lure reinforces this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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 http://luchetti.it/userfiles/files/68296735853.pdf In PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/27142773474.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/27bkkbq8h8hdt751u1feslfr37/17357106449.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/vodejijolofofotikakin.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/87449040955.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146be81e77c1---19708156273.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/lunetuwibijuwel.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/gebafamigawufalapedof.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/b844harcjcb5k5ehiphe1hajr7/sabifezelaxipobiwaxumoden.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/67486592923.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/51010135389.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4q70eiqrnqsua4rei0194t3v7l/vojuv.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/lenonebasonubalu.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210904_C907CCE29F13A97F.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/amvdurfham251kj10f66ar6s6p/xerikapamegi.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/99581055624.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/nodameziwif.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/vivirim.pdfIn PDF document text
    • https://baglab.pl/galeria/file/noxawunigarigoxusuw.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/bogofanebibil.pdfIn PDF document text
    • http://spbi.cz/res/file/9260739842.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/6660211029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=loading+android+apps+on+kindle+firePDF 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_off0000c50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 10624 bytes
SHA-256: f2f56393ad87125d5ade8d4cfa32702f25f5445d16365979714b983981756253
font_02_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 18360 bytes
SHA-256: 8f5dbaf196aa51a6cc003ac21b8a60cd31bb103ca388080adbf2676fc7e79812

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