Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa20a86a58ed3406…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 13:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3cb993a13f0ade2f535bc31e19a5c721 SHA-1: 73a41462e7f83edba58b52d053615f4c47f6fdc2 SHA-256: aa20a86a58ed3406b18ec57963d8a166e3687b0438282b19856e554706236c3a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=keyword+suggestion+tool+for+website PDF link annotation
    • https://ganganagardentist.com/userfiles/file/91433065125.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/89955059485.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/suganu.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/74189013179.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/fapirodub.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce869afe9---66222716720.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/zagavilunozomufidara.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/zitewosidamol.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6ff6c4d1a---68813990051.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/ninuwetobonimowizini.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/89724024142.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/pibigarobol.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/tinanelujegoxaxenelor.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/7967328388.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/56482058834.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/jipuwul.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613727b616825---mesij.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/kigexigujenoxuwalomesipin.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eed7eda22986ef4d5a95d4f070b8ae31/zopomokokamejikixe.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/xijoto.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/94480040204.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/luwapularavekawet.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/josudaxiwesuxez.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tutisarod.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e0d6f42580902fce47651123fdc8b723/ropisoteje.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_off0000b1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 10800 bytes
SHA-256: 1dd51ea1719840c96ae9865b8da6e1fa5b53f3bc70aafafafd73754dffc17367
font_02_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 15288 bytes
SHA-256: 9fb3bbd8718dc0b434b7dddff473cae79e26ca71a25a83f734bcc226a5351c75