Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bec69a381c7f7f…

MALICIOUS

PDF

72.0 KB Created: 2021-10-04 11:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9cefc588cdb6844a85845082d495693c SHA-1: be1a98d15f424f35421f3d8800a098cc3b1c1561 SHA-256: 26bec69a381c7f7fbef2f7abfcedfd4b1ce6253d64b50aa568d8df4b8649f2cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, are primarily used to obscure the true destination, making the link farm the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://satyavnetworks.com/fck_upload_images/file/rewijosasefijuxema.pdf In PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/todewabafifaxanibeparexag.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20211001_DBC9FBC1561F21CC.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/xujovazepopox.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dijavekekonadujokizi.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/tidudedatupiduriguvixoguj.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/jimowof.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/12853820531.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/luleror.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/julagugufapujewula.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130666f877b1---61285421587.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/12697569865.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/240405023.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/78280562504.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/kofigo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613986cb872fe---mevexataz.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4114e129---20633130237.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/pejuxipesa.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/79559042792.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zuzezekevivavu.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/14559193617.pdfIn PDF document text
    • https://anaksemut.com/contents/files/jixetoriko.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/tujuvewid.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gifuxodesaxoxigukedo.pdfIn PDF document text
    • http://sivam.pl/files/file/38604115780.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/wobew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=interference+of+light+bsc+2nd+yearPDF 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_off0000b317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB317 11080 bytes
SHA-256: a78f3c98810748400f0cfa0b63258e738e0bcf35d8024f31ea1afa4416098bff
font_01_sfnt_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 17272 bytes
SHA-256: 410ef5b3a90feb32c72dd4e07ff8fef3184eca1c7fb925e7b78d6d10aacd4ae3
font_02_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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