Malicious PDF — malware analysis report

Static analysis result for SHA-256 3179031f7c3680ba…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 18:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6abb201a0a030470a1665259c8429db SHA-1: dfd919133f7e9140a6841f0f2dec36bcadba833d SHA-256: 3179031f7c3680babfcda9285db302f4f9e3baeef00d14a1db0d4538eb0535d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these link farms indicates an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://floraplant.gr/FCKeditor/userimages/file/78528887357.pdf In PDF document text
    • https://minipowerpack.net/upload/files/60712941505.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/bevapabutasal.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/rurobojibekitetatideja.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/17178174416.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9a4cf32f9---tukerazasazifulipakub.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff8ddbb668---mazikipe.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/mexemuwenetupag.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/39586362707.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/sosajinerawu.pdfIn PDF document text
    • http://kasargod.net/uploads/file/zotivojuxanujuxem.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c1f3bebd3b15d18e6259fd74495114c/simumenonirepowodasineb.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/31671703846.pdfIn PDF document text
    • http://sinostandards.net/upload/files/samuketakinaruleta.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/vowakizefusojaluferiwin.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/kazijejagipikulevodubuxi.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/fulapakajojedimagiwe.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/masikumenudulenalumi.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/tatowinugulupanovukavuzup.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16121dd6f02591---24182543930.pdfIn PDF document text
    • https://asiajitu.com/contents//files/45404450564.pdfIn PDF document text
    • http://4bx.pl/public/file/xadelovabusax.pdfIn PDF document text
    • https://chp-travel.ir/data/file/sesilinud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fungsi+sistem+pernapasan+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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 10752 bytes
SHA-256: 64adaa053c56813e2830797c37649d8e224b810666605bb1f9008901df979326
font_02_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16160 bytes
SHA-256: db020bae7c3504f6352183bd116ed1a89929b2c596d6b71346369a5c3798a3fd

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