Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1f6199ac75118d…

MALICIOUS

PDF

87.8 KB Created: 2021-08-29 04:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b8d9ec8090a06223744f98d65710448 SHA-1: 36ff8567ef0932b3297d68ff0afea2ad9deaa7b2 SHA-256: ce1f6199ac75118dc63e2085e5ce4d3b5437752702f09c94fef306c4366f8c3b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing lures. The presence of multiple external URIs and link farm indicators points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=all+23+mcu+movies+in+order PDF link annotation
    • http://www.serenissimaservizi.com/files/52166559455.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xejejinajobajojekexi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e23d7c99c5---51915132396.pdfIn PDF document text
    • http://freetds.net/userfiles/file/limilopotiwolegitit.pdfIn PDF document text
    • http://starsunited.at/upload/files/fasatudu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2c3977d8a5d2be48daaa06996114bd97/luxifev.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/pujuzisirose.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607224b2acfd8---sadisodilal.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/13589932945.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/ximudokipagasuwamorato.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c3996a8985c3df5687911d97159b62dd/54866430558.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9b67098f4ccd232b841e4dff64d13de3/5023424254.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f9980da1c42---72488031477.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a204c9b2e3d---degefimag.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/mekolami.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/952f14f4699b107d48665dd3f3434e65/70319968841.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/viwejav.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0bd0d2877---xugobatujoxupanebezi.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/19708589880.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/pibuxibagabovawi.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/09792ce85961d6854875e5f896e42142/wegolu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c63644eb6---ganisadixozilinevelude.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3c9949c05a5cb77157fef32115ce57a8/75403695477.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/74513448648.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_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 17604 bytes
SHA-256: a0e855c8bbf9035a602aa44281fbd60c201ff9b1492536502e39fda45996a754
font_01_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 10708 bytes
SHA-256: ff89c15d654eb2cd2b2ca34215eabd300d25c515f0eaf2d1f3f7f07f5bb70be8
font_02_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1