Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4969b0dccf68647…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 07:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b65c41350e31837bf9fc5392c30a2401 SHA-1: 42b56a5a77c2a5430dcdad489a56a4b9a07b6c2f SHA-256: d4969b0dccf686477e9ba07893806edd30657b065094722412e0c9319cdc801c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=an+acid+which+is+a+part+of+gastric+juice+in+our+stomach+is PDF link annotation
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9g5gi5ofh8oacu80t3gackugs0/58603596973.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/lawaginadipereno.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/zesutuzuke.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/faxunabapozebobojuk.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9b5d13e4---84175135320.pdfIn PDF document text
    • https://grancom.by/upload/docs/rulopuxizifezaza.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/82693136075.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/rujizamawem.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/xovivana.pdfIn PDF document text
    • http://dhf-china.com/d/files/82998971238.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161492c4c833a4---35837144088.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/mufikafilirurisas.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/zeximuluruvozegenerovukaf.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/xaxuzopopafoji.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/8855829601.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/13647696944.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/14963081630.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/webagubidipepovawezutajix.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tepebejilibu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/wewuneneroxoseriregi.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/jinogexig.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd9b29928---bufopiwa.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/rumabalaxagefakuwelajumun.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/49720937135.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148139213753---69306252934.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/36545501796.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/95997191811.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/90983997869.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_off0000b86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86C 11316 bytes
SHA-256: 5caead70e090020f50a7553961e1e871c2feb3f45914d4b43706e7acb13ea3c6
font_01_sfnt_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 15520 bytes
SHA-256: e456afb92f53a289437670cdece387eb9899a5d3689adaa870e2b65b8d85936e

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