Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9c948fc1a97aaa…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 14:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c312cbf4459bf84c215c23fb0528bafb SHA-1: e1e7edb8b1dc9dc12a58e67d4617092b21fd660e SHA-256: bb9c948fc1a97aaa633bc54aa176153558b2ddcc644218a9b164aae23185db5f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic to obscure clickable elements. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.dooleysnaturalgas.com/ckfinder/userfiles/files/bevikuturazijadi.pdf In PDF document text
    • https://micsys.in/userfiles/file/18826162754.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/8386880531.pdfIn PDF document text
    • https://endobible.com/userfiles/file/23195425535.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/15015775484.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/99250833858.pdfIn PDF document text
    • https://linhan.xelinhan.vn/userfiles/file/tikiv.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/38805215714.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/8379986212.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4e9da5efb---44097053278.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/29745246632.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/zuxotudasib.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/88348415989.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/87463845437.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/js7ag2jiog7i4fbu7q2991m0m5/bevupufuzepitonasafoxuz.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/74827981384.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/22734672928.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/jofezoduzuwivuzu.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/tevevono.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb145a7943---68083883816.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/fozizovofabuwapuninefo.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/22640025229.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/baxiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+know+if+device+is+rootedPDF 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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 14044 bytes
SHA-256: b30034c0261e30bc6ca8daf7f1196f9de2985926fd2bf47c15c637a5f9978648
font_01_sfnt_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 10496 bytes
SHA-256: d6e517429589765a0e84e362f1c03f5203169e906e98fd9ed3dca6faa5bc40ea
font_02_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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