Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e28cbcb78c2063…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 21:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 54446b08bd77a1bf9810d606c5232951 SHA-1: 8286491a55fdca4ba23313720e2fbcaca0db24a0 SHA-256: 68e28cbcb78c2063916db6acecf7c581dc39d1065d493027a3697054d185d5b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://economiadecomunion.com/ckfinder/userfiles/files/wilarokat.pdf In PDF document text
    • http://www.thaitofu.com/image/upload/File/beluzebanilejulibibigepob.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7042900acebf952b1e9e3f176e97dbde/79382654406.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e6618570d82663add2db7c9d7a044b9a/bemawutoxigazelu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e2b0ab0178787d058341ce72aedaf9f5/46891425383.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160743ac3d0384---14953496491.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/sufinekevokuz.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/wuzowobo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecb683e69f---sazukoxajiterorilop.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/15222648301.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/46382013147.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a01071727---jugapifuvobadamawabok.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/bexivividuwopikogodemo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gha1lprbuhjrsfck4idgmtqf9v/pavepizigipara.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/18480299274.pdfIn PDF document text
    • https://htchninc.com/d/files/jevaxefamobutobe.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160866c3a69aec---49304829875.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/56oel8u57rq221csperu0p1er4/97553568084.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/54432370856.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/merapejamulajubirewuxedam.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/zusozawiramiruxizetubomu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/72637966573.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10fe5e1480---64547730498.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/4mjciik68vagf4iepn62s8odmf/60243863245.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/xojidexok.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b4e7538e---46318658142.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/toronin.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/64720673417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+soul+of+the+first+amendment+pdfPDF link annotation
    • 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_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 16936 bytes
SHA-256: 9037f82e0a55f1955eb4c4fec5f84b0087cee75c210bd79670d9d28e0e1bddd1
font_01_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 10828 bytes
SHA-256: 2e0d093790c2573b1b51d3f2492403571858ef39b4cf3b48f0a8e5bcdde3bbbc
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1