Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3d91d79e64ca02…

MALICIOUS

PDF

85.3 KB Created: 2021-08-19 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 345b4184bccbed083839494e4cddf9bd SHA-1: e5ece1f3ca581ca94021c0c1c62183b9093f5c12 SHA-256: 8b3d91d79e64ca0298debb16752bb5b5698c5b32c1c7252f197e8b974a92e172
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://dentish.ru/ckfinder/userfiles/files/92670139915.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ababee101---kimevomevokatusiw.pdfIn PDF document text
    • http://xhzhengli.com/upload/95318295117.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/musav.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb670e46583---juwimovukizonap.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/36413809389.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/givanilivevabiw.pdfIn PDF document text
    • https://bunianco.com/other_files/File/fapiv.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad146ba55eb---pazaxazepupomulaz.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/35823386120.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/15496632544.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611022a96e636---11864181861.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6482752a3f---97329568773.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/kegamipa.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/ul94q4m3r1lvot61qp6jq8cbgj/vesoranefifoxetogut.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb3416e73---7369038392.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd2176bbb---sudugulesa.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c44feef1e0---79012488814.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc1a50263---44342313098.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/46351510460.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d43c3c781---85225942560.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/22041616049.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/42797192437.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/16704416838.pdfIn PDF document text
    • http://geose.ru/userfiles/file/72241551702.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/56411323865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=comportamiento+organizacional+robbins+17+edici%C3%B3n+pdf+descargar+gratisPDF 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_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 18128 bytes
SHA-256: 09737c3e5bf1c1b2cb96ff4c1558ad5df012bbf789e975d1e55ee07b75ddcc3b
font_01_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 11432 bytes
SHA-256: 07d200398d5cdbec20977f14b3f6f4cd5847f65d1464d32de5a04788cc8e8319
font_02_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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