Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a635ad2923fecf…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 21:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1448580ab7602e3137c572270f09623f SHA-1: 4af3b88414a7a4a9f4760a8c2a014b95ea6625f1 SHA-256: 74a635ad2923fecf05180423db91e9fe9e593eb044fa236f6ea41fc2425a8732
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7144753e---mogonabibikudifikeli.pdf In PDF document text
    • https://amgaa.org/temp//files/juropaziwimajod.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb005b40d---wumubogor.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/fifafufajidegesitefalu.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/kiluxawizalizadubewela.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/nuzapusumisabagojomotu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f2c5f626b15fc5fe2439cd5d72934378/jufogabovijepilejafo.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vijalebanesagakex.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/42268607798.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/duvigalimi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7eaca912d---jakugematixowogelem.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/32463344246.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6267b1c47493370fdf4a54441ca9a0b3/29765938800.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/45514761092.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/ganemoliwaninodu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125af637e6d1---guzojowerudetawezanizeru.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210901043337.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/dasopufelogid.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/juxubonalebubipebapa.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/vitibepiliwegejowafe.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/50880745656.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/92668579725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=author%27s+perspective+worksheets+3rd+gradePDF 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_off0000c3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 11172 bytes
SHA-256: 1a1ab78c0fa4256b89f4a679efe3d76470fa95d5ba423b468d87106666c8c165
font_02_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 18120 bytes
SHA-256: 67886156b263e52a0c0383856e86df83078b2a2b7f20ccef9a868f0b1e6e8296

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