Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9a59236476bb6c…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 19:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2aaa8c70fc9838972d3ba2e59640ee2 SHA-1: b872bfa502ecde3dea1a7ccc26ef3601509c50d4 SHA-256: fb9a59236476bb6c666222804a01c4a0b0f737ee7e0549411664533f6a677f06
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 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 websites, some of which are hosted on compromised CMS platforms. This suggests the PDF is used to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=difference+between+median+and+mode PDF link annotation
    • http://planbmedia.hu/files/savatuni.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/375807871.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/17aaa429793daaf3fdddbcba9712a9bf/89479845160.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/88200329038.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba028e500b---26117360447.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/manuwososelugumolomewumiv.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/movovakapoladizu.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/58aa9febc0532f8824085e87a65cd5d4/rapodavakifogopikib.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-5/20210605134533400320.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/2156413106.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6piiis4vbb12c5b191gcccfjc3/77353741514.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609939a715245---50588357228.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/279fr5eu9f6189tcn64f1lmlar/27610620594.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f022920b1e---79315207962.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5b817f2e---zixige.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce36d4aeb---43858840056.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091192cc2c1c---puwupaditafozifowisepufi.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e96ba48829d739ae7d412bde25121137/24550479160.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2299dc32b2015927b8878f253048f917/18846216557.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/45408895852.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/66920467475.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/83508645151.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/rasalugu.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/zuvarifeba.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a1c56f4oj99urvt1renco7j2ru/dososagufeteruwavogovip.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e76b068a11f608fd1041c08a8ee6d06f/baxowanufabafak.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_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 10652 bytes
SHA-256: deb10f6a40c0e460e54eff2d82cb0892d2c31df971628d855e6080805e7b1499
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 17184 bytes
SHA-256: 70323525deec4e23f43dddc4ae9331bc5671b29f12d22c50313537af6d06b913
font_02_sfnt_off00013690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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