Malicious PDF — malware analysis report

Static analysis result for SHA-256 d067452af344d627…

MALICIOUS

PDF

79.1 KB Created: 2021-07-04 04:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af11c91580eef8fad0c4983ba6dea44b SHA-1: 2d811bf6cfec216a50d6d598cce25d8ac8bdcfae SHA-256: d067452af344d627b945cc18c15104da1dfe9cdc8b8d68d991c4d647a65bd3e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a malicious document designed to redirect users to potentially harmful content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=the+arrow+and+the+song+question+answer
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f4b0fa61de5b009ab3e0ae2fae3d962/8749774452.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/538a68d90a0025c4fe5cc51cc0cab222/81964673625.pdf
    • https://marosme.ro/hirek/file/71639189587.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2ec9b344---wejubusobanifaremokaj.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/13843724775.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81422e6c5---3409183681.pdf
    • http://urjabatteries.in/userfiles/file/muritedunulakeremab.pdf
    • https://euroroma-bg.org/files/file/lutikazupu.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210625_C38A5D8F010165DD.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9d2853e97a95fb67bc70c52295033d3a/80348513568.pdf
    • http://architettorobertafasola.eu/userfiles/files/tenopunidej.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-11/20210511184858281718.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/42281990672.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d2158c91---76694620698.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/fuzifogusikedemozofimagi.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5dmi4adk4ehi9kvnbqr7cr31v0/masuvoriwav.pdf
    • http://asupuro.com/user_data/image//file/xipolekoniwogik.pdf
    • https://danielstrehlau.com/userfiles/file/pofojosele.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f252a26d4---64838749990.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/df967898d63f80a564d423ed8dfec8eb/24778985703.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b8852214---76655978201.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b45ce434---30362034041.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40970ef44---77841901799.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9ab2f2090c2c37eef73d4b58cc3fbf74/79922969588.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b16884e---31754570600.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d26c.bin
cd3850c54eddb5a908fbd616d3e75acea63bad5ab20928c2b97f6587615cd7ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 16928 bytes
font_01_sfnt_off0000fe6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
font_02_sfnt_off00011682.bin
f7a7929fd638daffc3f908511c5cce3cf54c909f85f28201ca385cdc2eb0f4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 10776 bytes