Malicious PDF — malware analysis report

Static analysis result for SHA-256 337cf0d1cd53e72a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 19:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea94de8d6c4ec9ab871045457dc83804 SHA-1: e2ceb1404a2aa6f4a24ab8842c42f07378e3ee51 SHA-256: 337cf0d1cd53e72a1dc1a4e4cdf75cd3c07228505ddb401805e53ab3ae4e2cd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is a common tactic for distributing malicious content or redirecting users to phishing sites.

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 http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/91332993010.pdf In PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/zugepetoluledegitok.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/29652443264.pdfIn PDF document text
    • https://mashura.co/userfiles/files/94892626755.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/4738948997.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sasagokixamoneze.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/fixokov.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/88111867339.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/xobogi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144420309f4f---lofomumaxosijepowakar.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/83382222621.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/34855204431.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/gebetilimilo.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/wilil.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/wozaxejewus.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/jafoberesotodirikovulir.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/dolavuxodipuzemepaxerokug.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/nojoxek.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161443f7cd267d---rafutawenakusofugisa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1832243fb---rabiduwamativovojefe.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/mobunamosesini.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/96512994531.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f159a08230---kimuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=name+of+metalloids+in+periodic+tablePDF 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_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 17920 bytes
SHA-256: cb871368c6535fa73b15ac3dbfca8b964e4dd3fdffa3eb54a276a21e8dc1e565
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 10900 bytes
SHA-256: 63f56b3fedba0111cfd1b3ba42814e558f7609a163f656de8da1350c47cadb7f
font_02_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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