Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72666ec6cb84761…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 19:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7396d5d6edb0139839aee50c6442404 SHA-1: 9405798093d39df5907ba5eb4f6e9ecb129bcede SHA-256: b72666ec6cb84761191587893ebe9284eecf57f2d34b9ac99a0cb9476ae8a804
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://malashealthcare.com/userfiles/files/wufasebegopedagebik.pdf In PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/pidivifuridizowuloxezured.pdfIn PDF document text
    • https://educhina.mn/editor/files/16434958016.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135679e11d22---jototofumez.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613358b04e978---vinazuvegam.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/24788150208.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341395d7d8e---7120441030.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/satozopemitirila.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/6736759330.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/96316370784.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/99471876172.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7399850b3---90896432069.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/kewafavoladuvafiforupu.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/mirogedijevotefogun.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/64174741728.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/37380412077.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/27173103965.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/tisekatakivagisavum.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/fumifositumoliwolaxe.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/22793630553.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f81717535d---fatazi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcee413c58---gaxepuratizotuj.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/85475815956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tao+te+ching+jane+english+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_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 17612 bytes
SHA-256: 1e1e70e0e4f247e94d7c94097641e4fa983f9462c84ff3fee50695e72650208f
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 10892 bytes
SHA-256: 7d63619f786e180d1fd7b427ebb57cb90e843ed21cc59bd92ccefaf64fbabf1b

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