Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ca2f17139a15f3…

MALICIOUS

PDF

95.7 KB Created: 2021-09-19 11:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 521f2c3960bf106eba979be86a613d0b SHA-1: adb3fe4d420940cd76e5d970976f8ee64e2177e4 SHA-256: 70ca2f17139a15f3cf7bcb7d01957b8d571bdb72566476c4d0e574ce087404d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to manipulate search engine results for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://catamma.ru/uplcv?utm_term=minecraft+gratis+mobile PDF link annotation
    • https://ceccargiurgiu.ro/userfiles/file/fikeza.pdfIn PDF document text
    • https://autoskola-scp.com/files/91791480455.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/nimolubugi.pdfIn PDF document text
    • http://packamate.com/userfiles/18387503711.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac6838fa6---57026731936.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mamifalobevulomexiwakot.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/62991120675.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/15031943177.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/ropijeporiluvopogax.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mj79pi5v7dgtll8unnd02d9se/1570754657.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/fujevupuwavig.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/lonalibirijefuxe.pdfIn PDF document text
    • http://jadeite.ru/images/file/mibalugodiso.pdfIn PDF document text
    • https://viettrungson.com/media/Files/36071079017.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/556576e2bd6cbf98187c4341052f1236/pozapiribafumiruluz.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8337458204277cd81f8fef2657acbfe9/mifix.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/zonunifofajebakudik.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jamukoguripatebumuburuzi.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/dogidupemoze.pdfIn PDF document text
    • https://umutfm.com/resimler/files/40708621863.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097a773ae8---vudedaratofarigoxure.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ccec1df6f---govubujak.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/64187410262.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/pimogixoj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 25120 bytes
SHA-256: 30e44fffb8b61cae149bdf4fbe88f8548ca38a2afa595385117a3523f9e9399d
font_01_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 10812 bytes
SHA-256: 8e44c2a4a702bcb23226efbb0d183f3f2040737b8784c6ec21d8b08159197116
font_02_sfnt_off00013fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE0 16524 bytes
SHA-256: 4f0215f6ba0486b9da52d3d183ec12aae2c97362242b7c2eee9b877b72c566d8
font_03_sfnt_off00015709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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