Malicious PDF — malware analysis report

Static analysis result for SHA-256 00653cbf08625200…

MALICIOUS

PDF

91.5 KB Created: 2021-07-07 01:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06c6326723b137fed9349a23d087a779 SHA-1: 768035879ec57f20290fdcc4efc78f6edbcdc962 SHA-256: 00653cbf086252007f4360a6da6d0f88528f70a93ef79dcbaa820ed56f8186e3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple links on compromised CMS platforms indicates a deliberate effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/bhqv5u583v2j7aoailf8ip0082/kotegodadigetumor.pdf
    • http://zimaletto.com/uploads/file/mirik.pdf
    • http://fipjp.com/userfiles/file/54347589640.pdf
    • https://aradovan.com/userfiles/file/52547186690.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/busijitipo.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a98990e4---vajegafixekutivuravub.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e176cc41d4---namareriduvipafufomilujir.pdf
    • http://plafondchauffant.fr//img/user/file/21830443512.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160758f9a25e0a---61436037796.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863e50a1205---36852131795.pdf
    • https://semineebrasov.ro/printuri-fi/files/ronavere.pdf
    • http://df-foundry.net/d/files/japara.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c0564ed77---gimez.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff86c84d8774f44d8bf89e2e3262a2a0/miforipozed.pdf
    • https://okazdedziecko.pl/_files/Media/file/kozawuzusagab.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/32564258617.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/91fb1a8a6b42da3d361772413b801135/rukifopewusuvev.pdf
    • https://camping-du-lac-dijon.com/fichiers/vorirugasujow.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc344e7496---bugijixolewemefurib.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/p5vpgh172u9avrhrgcad5vto93/nonagafona.pdf
    • https://smilepaper.tw/archive/upload/files/sufodeza.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f641cbd21d---kiwik.pdf
    • https://marljivo.hr/UserFiles/files/73149538690.pdf
    • http://yuanyoujie.vip/userfiles/file/99291545953.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dispatches+from+dystopia
    • 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_off0000fffe.bin
9937cdd0ca88b88bc160c1007d93d607ebaa2624fba0cb078ba9327bfc7e0145
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 17632 bytes
font_01_sfnt_off00012e1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16792 bytes
font_02_sfnt_off00014632.bin
4fe185c17dca1fe061d02c573f4448f1ab78ec9c9b738c25028ec550b52dbd7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14632 10848 bytes