Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafba5fe23944e62…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 09:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40cda0e5d73675903eb1fc9a30641114 SHA-1: 37b1221c45529de1eccdb826c643e7c2c8bd3111 SHA-256: eafba5fe23944e62f913b400823394f971b7cfbc080661cc983635705b8cd011
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary goal seems to be directing users to external content, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfacd7165d---28134326227.pdf In PDF document text
    • https://dentalrud.com/userfiles/file/xajivojivomepasodunit.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/rinarufofofujatufurutu.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/31375025325.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/sagivakidafubipafobas.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354b8d2f912---89016831004.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/k2fd6e4os6pdthla8pe9ldoquq/tomuvuwulito.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090305192873499.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vuzaxopisukuzami.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613037bdb1a2f---walumifimilinedate.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/takadamuvoledinu.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/69957022443.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/71655737842.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161474e4d113d6---90191465048.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pejodaxob.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/15801454490.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161459356e28cd---19846064840.pdfIn PDF document text
    • http://placc.info/up_image/13064130952.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/kurol.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/fca4dfca278cef0cec118d916fe0c39a/mexapapixowatevugeza.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/medikuxoxowerumexegilad.pdfIn PDF document text
    • http://hmed.vn/upload/files/davaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ultimate+car+driving+classic+apk+modPDF 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_off0000b92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 16000 bytes
SHA-256: 2bb21fc79461a058a934d6b8ca8ca19450d6b04e194ee2dedfc120489577b1c5
font_02_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 11020 bytes
SHA-256: 1efc4a5d45e773846e981eabd7fd186ead89422116b9f5e0522ad2def76a37b4

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