Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd7af1506b07ffb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 06:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 273017ce6dcca14ec8a523c5c6e04bc8 SHA-1: 22ce71d19fd2f244cc15a7c872524ff5848ac4ff SHA-256: dcd7af1506b07ffbabc693eb961d6c817b2362335d62039a045c7f7eab659265
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://antifftech.com/uploadfile/file///2021050321593628.pdf In PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/05c6407fd9c74e5e264cc97e65f4a357/30070354323.pdfIn PDF document text
    • http://manuscripthandler.com/userfiles/file/80976023783.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/67817576405.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/83787866131.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609278c7ab465---29462053352.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/25739269486.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9323481ae56127dadeec849142e29c9b/47901391929.pdfIn PDF document text
    • https://isosklo.cz/uploads/23984205269.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210821061947.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/koxumobapoviru.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/22b24b605cdab898f8e57c457a66c5e6/befigiwa.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/guzewigenibokodoxiv.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a812fc3a5fc---rigowumuzife.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121f5283e5d3---94775374487.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/kilemizan.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/xonuwozolulujepisix.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/16124780065.pdfIn PDF document text
    • https://kar360.com/resimler/files/73131387947.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/paragarugorewajivitumid.pdfIn PDF document text
    • http://cocoal.com/uploads/file/19200523923.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/nibuwizomales.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0904643b88---widadigag.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/teminoniberikodav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=diccionario+nautico+espa%C3%B1ol+ingles+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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 11100 bytes
SHA-256: 140de3c42c431c4afb5bb29eae6ce6c00ed4ae9e120225cc7bfece33be54f639
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 19432 bytes
SHA-256: 5dad37e2d55cc34d62b41d331d59a37d0047974eb3caf648afa6126f5fb2fc1a

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