Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4452971fe81551…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 22:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0aa28fca02d8f6188cc73fe114ff709d SHA-1: 6bcafce819f6620a24198e557b055bb302858205 SHA-256: fc4452971fe81551780ec06278477158b1a7663b7fbae330bbbf808ca2d18c66
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic indicating it is a password-protected archive lure, suggesting the user will be prompted to download an archive and use a provided password. Multiple URLs are present, some pointing to compromised CMS upload directories, indicating a potential distribution vector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/jemazude.pdf In PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/zosudewisimaxenuse.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6137a8da2e750.pdfIn PDF document text
    • http://infosantiere.ro/userfiles/file/91630519036.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/senozidolimexatup.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fadinoxaja.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/21741188046.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/gumanuduv.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nitubugekisixe.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/68655839896.pdfIn PDF document text
    • https://empresa-venta.hr/files/73008904505.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210911094723.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/58769308119.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/gupivajeros.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fa5afa7eef0046200b677c35bc0950fd/rodatogesojujopokir.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/51d277f228326d97b19be79436f9a39c/55925355574.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/55425a1702025653204f669a4f015f6a/gogetosudusewezilojiwafo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe3cc329---5046970030.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c899e3ea6---53473053471.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/bisebuvobisodivelu.pdfIn PDF document text
    • http://guowangcable.com/d/files/19331689792.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/66045221426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pes+2017+ppsspp+file+downloadPDF 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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 17828 bytes
SHA-256: 319fcab0a8786303485eea493a3087063a0f8151b71d016db20846c1748deae2
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 10724 bytes
SHA-256: 76b864ffca0776b51568e170fec956679bd61b7dcdd4162d3c6df2ebcb60ecf1

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