Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9d8783c7a51f19…

MALICIOUS

PDF

104.8 KB Created: 2021-09-22 13:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 179351bda037168eeeed7833eb486c55 SHA-1: fd9a4557ba30f87247a1593356a12c09a9bb475a SHA-256: ef9d8783c7a51f19855dcb63f570b71e753246c7a9673920fbdc9e1d810e5f9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is also noted as having duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d702bcc23---92687992810.pdf In PDF document text
    • http://magogaralbamoble.com/galeria/files/68433077337.pdfIn PDF document text
    • http://boldogelet.hu/media/42534798888.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/kigetiwazik.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/40754259921.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/muwawowig.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/26102323484.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/52861573934.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/10969131770.pdfIn PDF document text
    • https://best-label.com/upload/files/xalonizijimuzev.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/20282829418.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/xitojenesovobokuximadove.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/joribudubopigus.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/97402127084.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/23513532204.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/94174851262.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/37815660919.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b35bff1b---27129050535.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/74334702510.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/zetixofi.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/pirisupesejojolokufideku.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071825462870.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/4303578518.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6f13821a---guvukuriwib.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/nubori.pdfIn PDF document text
    • http://parentini.it/userfiles/files/40052302713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mx+player+10+bit+codecPDF 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_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 19280 bytes
SHA-256: 9eb15bdc907d4886b50b52e38ba711aa02f7d448db9895106a04704709b5a1cf
font_01_sfnt_off000164ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AB 10760 bytes
SHA-256: 9e532b68117797c81e31b4e5f0b83094f5e660af61f08cc83a7ffcf3122d16c8
font_02_sfnt_off00017d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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