Malicious PDF — malware analysis report

Static analysis result for SHA-256 555fb2388e1115f3…

MALICIOUS

PDF

73.0 KB Created: 2021-10-02 20:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00323419d589f517774eb5cb6520990e SHA-1: b296809569a4151658584d5fbcba2a542771a4ee SHA-256: 555fb2388e1115f33a3a9c11b2f9bdadac217c24c3eb4b5b4a9b024c6b100e29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reliancefla.com/admin/images/file/wepeb.pdf In PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/8219509072.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42d95ad5c---73064840080.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/21523278788.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/nixufimedu.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/19820135633.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143f51ae06da---vowatetazegibek.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/87262571353.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/jigukiwonato.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/27237264105.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/bovufetedoxus.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/34397246824.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/87985899868.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049d71780d---wusedisagomug.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/gomenef.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/32046892530.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/94292872897.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/wugatoworevifulojewo.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/jawadezawokolu.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/tupovigilitosagatuxitawim.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/81188154927.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/49503651537.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/widuj.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/70612365790.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/nejemimarojupuribavipotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=an+insured+purchased+a+life+insurance+policy+on+his+life+naming+his+wife+as+primary+beneficiaryPDF 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_off0000b596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB596 16844 bytes
SHA-256: a123ff1de29ea0cb709ff1a875ab5190522becb26e308ead6b22081b7d0af776
font_01_sfnt_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 11392 bytes
SHA-256: ff305cef66595cb7fe926a66191f620426a242e032834d816ed8ae7524389901
font_02_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1