Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5a4be5c3adf1ca…

MALICIOUS

PDF

107.9 KB Created: 2021-09-05 21:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a3bc591163b52eccad4222abf856c1bf SHA-1: bf7950312234d1d556a4c36258ff4c8ba1a5c284 SHA-256: 9f5a4be5c3adf1ca390f645898d86bfce39350263b5674d699bb8f144bd6c8b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of external URIs and the overall structure suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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 https://allytemp.ru/uplcv?utm_term=entering+data+into+stata+manually PDF link annotation
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607374b28729c---79856988765.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e869b3a0---mutovagod.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f8d0f9e163accf505c8d34ef30622050/tilesu.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/votagujos.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zalenodalopo.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/28099299386.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/53931937857.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/virodikomujo.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210719_ECAED019329853BE.pdfIn PDF document text
    • https://campermagazine.tv/public/file/16917400111.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/25814151015.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16070ec02ec23a---jekekipu.pdfIn PDF document text
    • http://redactron.com/userfiles/file/gopulokufibavizuxutomez.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/dotodutibamifi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bd74d25e---44165988502.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7nm37evbjjiul3rk7docbdtkd3/28899610027.pdfIn PDF document text
    • https://baongochoa.com/upload/file/22571437632.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//88139630562.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3fa1130b19f893591fb8e9b6d042e14b/witofid.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67712977474.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xogirizolezelerofevapo.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnde2vbevvb1n12j2988aeikn5/ravupuvaniju.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/rorikepozakuj.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad94564fd4---rojirekar.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rasamidiloxibaro.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_off00013e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001567d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567D 19092 bytes
SHA-256: 654e9285dcdcea35d2220ba061f4be131acc1cc06666dd03d45690b732235175
font_02_sfnt_off000188ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188AB 10788 bytes
SHA-256: 10487c3cdf9e8582d1ff5042b1f9e5dfe5f0a3275839689c26797039ac4544f3

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