Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bafc74e6e66930…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 07:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56c3072f8c55d149ea637b090fbb47fc SHA-1: 12c491b1acddf80b4a26f2b688260d1d5bfaa543 SHA-256: c9bafc74e6e66930ae49c8e4ff1f7d98f6833fa76918a3bbc7ccb818ee4ec2d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the primary goal is to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=as+a+synonym PDF link annotation
    • https://tonerihned.cz/userfiles/file/17561649445.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139297c2e4---28020542010.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd29626b81---88323910468.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/wisasowujuvuz.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c50bbee58---56278917351.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/xojuxoru.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/48863595784.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141230d03741---6108394879.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/88203654598.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/kapowata.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/fodupilabogugilulebiw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86013400054.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/janebudurewojigomavivu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161416cf78c541---14240425573.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/pozeper.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16132548265555---80274373840.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d4e1b098---fosavugosagod.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c05868fd8---tajenogowizegif.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tepezubiduveri.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/60990580373.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/33845874456.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipozapopuna.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/62317408376.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/solizor.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/53424123307.pdfIn PDF document text
    • http://didopack.com/files/57110877025.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/donuxidal.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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 18088 bytes
SHA-256: d7de134c57e4950128b7979ca46c4314e3fa802c3f26a77f43ccf6296f44990e
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 9896 bytes
SHA-256: db435f4718c2c21510d26196a55ce81ecd61ec83dbd46085b7f2166c39985b45
font_02_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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