Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0524c4dde71c27c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 08:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8ce0b33de137104986f495ca895221c SHA-1: 0082359157726f86c1d6f2a3f41b528b3222c667 SHA-256: a0524c4dde71c27c93841a21c035281b7f5da66c249d4cfd41ae60345b9677d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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 http://albertf.madteam.net/ckfinder/userfiles/files/82507207535.pdf In PDF document text
    • http://tolaniprojects.com/userfiles/file/lurobenaxisivij.pdfIn PDF document text
    • https://stormester.no/files/file/finesogewefutexevagej.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/96314918308.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78402840285.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xeximekutejonuperisokovef.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/11434202603.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/29896192941.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/50823282229.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/43465278980.pdfIn PDF document text
    • http://hasyo.net/files/file/revufapawazaletenufisoxen.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/gexunaxusexemunali.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rolalinukuguvax.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/buteleluvogujenabilumub.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/eqnbpsqq5mrr9v34pg4nju3e9u/60929105317.pdfIn PDF document text
    • https://olterus.info/contents/files/3494871591.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/venamawadipaki.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/65713814726.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/12858959025.pdfIn PDF document text
    • http://chemicalengineers.ie/images/jotesikolonuxukal.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/4d8f22cb2598da349e9ac4317d81263d/30294452862.pdfIn PDF document text
    • http://feminella.ro/upload/fck/67830077723.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vabevotikezoji.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/63485027687.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/62632879353.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b55d05a9---tisutopopezojebewu.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/jivudolilasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cast+mobile+to+fire+tvPDF 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_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 18056 bytes
SHA-256: 915f1c600c3e85514b23a6aeba41d49bef9994284f5e299a6ecec2af275df710
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10508 bytes
SHA-256: e8974d2b779cf32eeb581730a6f908fbd8dc2c4e5107c7737186b77f1246ee01
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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