Malicious PDF — malware analysis report

Static analysis result for SHA-256 d247490265f0dff6…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 00:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95ed2d49bcf37ba296be301c16a3ed8c SHA-1: 034648afe489329b9f3357f020c3e641b963607e SHA-256: d247490265f0dff63d59dd427f2453c5bcaefd63c3303ed4172e76053cd1b16d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links on compromised WordPress sites. These links likely serve as redirects to phishing pages or further malicious content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ku2l9lnli54ro7bu6igo57u6ts/defezivamuwowiw.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t3b8gjdkdsm6fi13jpofdeb9u4/78197488647.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/kogukesovi.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/fuwotitinonugetowegelod.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbf92b707---nixikisaxeki.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921e2db1219---vazozenifoxiwat.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/buvejevufixu.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/33912215519.pdfIn PDF document text
    • http://africareview.in/userfiles/file/vuzevowunulib.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/d8530a4833fed1a4fb9661e6908d655d/97812096358.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/56466444054.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/15264811875.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/46cafff9bf2dabcd045b52d76acc78a7/66901668078.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1056b27da54b95f3ece58ad8d4eaace6/nafojatekitekub.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/gasatesufomezevotaximetak.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/32494759075.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/zaporinonodina.pdfIn PDF document text
    • http://hkalc.com/userfiles/sasanexaparaxoluvafixajen.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/vazupajetazaxuzeturu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/609d633b6452c8cc1165c7e60678f9c0/2699124284.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/99760636007.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/40977901712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bible+on+one+page+kjvPDF 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_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 10540 bytes
SHA-256: 85183c9e229c27800121cd519e9bde60ecc95795ff3e9c2c344becb74682c662
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 18388 bytes
SHA-256: 46c29783edaf08e518413e452d6985388389dc111f15d9948f6fa18050092feb
font_02_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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