Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2dbce3a4de5205…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 00:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d25da7105c39b7159eeaa61eaea6d87 SHA-1: 08629fe8c370cfab0f771ce15f5cbc26553081db SHA-256: aa2dbce3a4de520586f67b22e964fc816a45d9fc7868387c15a655c10865a277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to lure users through deceptive content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/uneqvr2bqbh2smictfg3eeqri1/pumupaxotokaguwijeperuraz.pdf In PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/43531408006.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/41561081188.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149f32dc1202---20732702330.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/74795268334.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/27673407378.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ff755e158---gotenasebotitop.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/6906130632.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/dovige.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/53888596132.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcce067a86---37426160960.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/18002177435.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/libidibabiradurevowo.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/galunuvanif.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140125502ad2---pizuzowegoromozuladexo.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/ripusifimoretutijasamob.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/sonilogen.pdfIn PDF document text
    • http://proxima-design.cz/files/file/fukuxajivodori.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/29533253325.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/65039204230.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/lorekatigure.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/81092758854.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/184b4cd7e4ccb980753ec61d661df34c/50348850424.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b686cc4ce8899f90a57bbe47ce42ac8e/zogafediduzefukoz.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/73998223290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=10th+class+biology+textbook+pdf+downloadPDF 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_off0000bf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9F 16680 bytes
SHA-256: e3f5d37c1303c8b68bcbb8531ee357438dd0845a72b2a279bca6a16b3ea02dc7
font_01_sfnt_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 11408 bytes
SHA-256: bd337e176e4e7cf0595c5b04ddc4432d3d071a3e6ae63f1f224e16860e70849d

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