Malicious PDF — malware analysis report

Static analysis result for SHA-256 154ba8dd465c233d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 12:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c1d5962a1aba0487ba54b627bfe8473 SHA-1: 85cf359e850e730fc50810a1f59d381a9abe9642 SHA-256: 154ba8dd465c233d588a88bfb59438993af3c99086badeb61d075fbd54ce8b79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various disposable domains and compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vikohasanfiber.com/upload/files/zarusugelowibe.pdf In PDF document text
    • http://cl-metalparts.com/d/files/10530082294.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/80927236404.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/54980649283.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/pikigubukezeluduvus.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dfcf474b5e1eda26a4348aa414228881/bogesubamakamekamolit.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/kunulubep.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwexoruneboxowuvivare.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fuledogujulijupigupurazun.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/913e5ca24b6be85ed8a59a7a8cd11644/wixexaxibe.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109022120542991.pdfIn PDF document text
    • http://hangquangauto.com/files/87699373224.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/96015830898.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/sifemaxopisa.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/warebizuwudu.pdfIn PDF document text
    • http://full814.com/upload/files/vaxixerozojojukid.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/wuwadozezogimosi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/962f98aad91b5649becc003bc064e1f5/jogafipizo.pdfIn PDF document text
    • http://gr-chem.com/upload/files/45366664404.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/14157432424.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/92964464337.pdfIn PDF document text
    • http://ihdbd.org/upload/files/kenesewomab.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rezomaxubaxixugupevoloda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=score+match+mod+apk+2020PDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/jezizumavozejosinuju.pdfIn PDF document text
    • 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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 17128 bytes
SHA-256: a9fadc5618b95fdfcb4412831702b95d0360c4843f5218cfd391cc904ab15d8b
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 10780 bytes
SHA-256: 87cecffcc811f3efd16d84fe8a1f533279c1fd991a373be21f61eab453c1e4d8
font_02_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1