Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a42c1328714a45f…

MALICIOUS

PDF

85.7 KB Created: 2021-08-20 10:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eec15195aa13e0cac645f6620d9b3fba SHA-1: 4c9dd88b2e4fcc43c877282082f56e9d955bc322 SHA-256: 1a42c1328714a45f5eb6c14014506f20efc241f36307c5db2f7b4d1e3daa6937
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://liniagdanskzydowo.pl/files/wujovutoxilibijujosaj.pdf
    • http://iziusb.com/userfiles//file/vigunuzaxuramev.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/87663684455.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7077b67dde37f1b57406984677770752/43087672156.pdf
    • http://chinamakina.com/userfiles/file/dipemiruxe.pdf
    • https://urbanshapes.in/userfiles/file/nawujofuwuzasijideti.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5d6b9f73---wamatadavijorifekeruxulu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16099add6ae0a9---jezijemone.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/50eab5de3dd1eb62c665063ce2a338d5/gowotilegizexuwimegigij.pdf
    • http://cloverpark1959.com/clients/51168/File/54934213776.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d1b6024d---naxokokifipel.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee60add5b05---49990265137.pdf
    • http://hfengly.dk/skoleportalen/userfiles/file/28954638355.pdf
    • http://klwas.org/userfiles/images/file/vugitiloxoponito.pdf
    • http://trevelci.ru/ckfinder/userfiles/files/pimibuvoxonetapu.pdf
    • http://satakantaresort.com/user_img/files/wivinub.pdf
    • http://dachastyle.com/userfiles/file/50571766645.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6039b9b8b4---murojub.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/98e0ca3bea6458d5ff6ca6e08af2d70f/fitikevililixutomuno.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/072e20b42b91b1f2af2cb5d9035f9117/99381844588.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/rabim.pdf
    • https://vildmarksjagt.dk/userfiles/file/82612499817.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cambridge+english+for+engineering+audio+download
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cbb0df20b006381b87a753030113f6ba/gagokimezemelowosukagog.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_off0000e7f4.bin
11c555456f4b62c6b68dbeb4e49ef6f453224d2419238e1e0f76a5d2cdbe417d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 17148 bytes
font_01_sfnt_off000114e2.bin
7ab6ad9fbfbec4926787a8904902b8201ef0c5ca0abd186117bba29d2713fa87
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 11060 bytes
font_02_sfnt_off00012e3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 16792 bytes