Malicious PDF — malware analysis report

Static analysis result for SHA-256 da692cb3036dc0d0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 22:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3432c0197039c9fd823cf06a35c9200 SHA-1: ea42b1ae56a8d572f253d1fdaee5f41262c8ca5a SHA-256: da692cb3036dc0d0fb56ed9f3eddae0b5e918cba6c7d7cfaa0bff7c86aca9430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=download+pes+2020+ppsspp+android PDF link annotation
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/19311658798.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/17868757727.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/naxudivu.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mesikilukov.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/916939e2f235b34e1ab0b082a9e7276c/87921073998.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/zezakosetovosiwefapu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/36i8rprg0rviqge82631olvgem/23721311639.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bukanevejuli.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/57286641409.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/monotanegodupikusarob.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614151c9996e1---3221994320.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/62303950901.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/14943495098.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/16008510786.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/gupumipaxataruxizofari.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/99207972338.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091803581859.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/tufukomexasizesizazive.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332233b10f3---93992933284.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/88346981269.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/demodatokopus.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/woluk.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/zegojekuxuzo.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/26892617178.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc710e954---nadigiwot.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/52319596724.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/10952584810.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_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 19088 bytes
SHA-256: df876a1f910bbe736bf6978e930dc2eabbf5ce68afa248fcea5d0c7522c53fa9
font_02_sfnt_off00012a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 10616 bytes
SHA-256: 7aa66582c47a7b2a7d92ac7413be0b072cf62f7da6b34425e8da39cda333ecf9

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