Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bb0ca627354c27…

MALICIOUS

PDF

102.0 KB Created: 2021-09-08 03:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e15a9f741d57d2f947b336504970232 SHA-1: 6ae1674bb9c21448c64135a42fb09866a6d9b47b SHA-256: 39bb0ca627354c27cac475329877c9427d94499ff67bf1f5973006a60eaa52a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or scam campaign. The presence of external URI heuristics and link farm indicators further supports this conclusion. No scripts were extracted, but the overall structure and URL distribution point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=esteatosis+hep%C3%A1tica+moderada+pdf PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082a85792e4b---37449301903.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075b42807864---fawureje.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e8207ddd4ab8adf190a422e8b80a4847/79039765199.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/6873129020.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/nakevifadarigarevo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/05oe0n53ssqk695sdk3mjij61i/1768307699.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa686db7735---zugubipix.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e32dbbf8---28255966929.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/79b537490c7a75ba18cdcf0e682c8d09/76755241505.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/zedufojatugabubusivur.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/xelomiromuwofubite.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210614182621.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/25846474904.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607824d66bdb9---lukere.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d511fa32---51789599801.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d5118f3ff64bef301bbdef894d080ba6/beviroz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/e0267pj29919sn55721eb1us17/wapoxelororo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/viborifekimikawugafexitu.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/jidogex.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/bolukuk.pdfIn PDF document text
    • http://sun-tes.ru/files/file/55672194639.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/925c82695360338bf5a27a5839826574/mibilik.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/xotamakopa.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_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 10896 bytes
SHA-256: 3bb47ae9c0a9a29adebb9893012cc9a8b13feff744efb7f07498495213ef0bcb
font_02_sfnt_off000158f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F5 18656 bytes
SHA-256: db40a95589cc58f9a81d51abce6b167f43db2b54dc646706bffb7477a0de241f

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