Malicious PDF — malware analysis report

Static analysis result for SHA-256 da44d27a8a95a834…

MALICIOUS

PDF

79.3 KB Created: 2021-07-06 20:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb5d1c97100f850a9d07d0d2516912ad SHA-1: 14d78b6a4dc19b012f7e62fb92ab802a23071d89 SHA-256: da44d27a8a95a8341a38cefe522c8e8607818a655339913a808b78a0324e7b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/015d46ad8bcd3e50916a40586b785fe4/fozojoki.pdf In PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/29111625191.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a61f4ce760---94955322742.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/10549598050.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ca08af16---86196524052.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/16dcbadf4381dd1a4f8c9f25f1aebb58/bevexe.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d235e6b7145---dixeperuvidej.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4674635d4---sotodi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7b20c019e---5709754749.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/45519941682.pdfIn PDF document text
    • http://strandedtattoo.net/file/dekosiwugeloposuxa.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/jogizijefuzol.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/4441025477.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1e4a1e7a3f076c94910b1854fcf94b4e/gipudenevagodobigosasemu.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/fatilujefivoxej.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/75424705823.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a78fc013b---65705143246.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/mexurifekuvusumapob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bfc0c86eb---gilakexisogesodiririgige.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081b801ea809---75881414548.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607513acc22ed---19555884103.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdbbceb1e---wevaborositop.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/guvumorazo.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/dapuzimenovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+emerald+forget+hm+movesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 16640 bytes
SHA-256: 8f4d1f5512566cb1d909d6109165e19f5cf698db2c7c4d59d8c6eb54fc0abfdd
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 10868 bytes
SHA-256: 30c8e92c094698bad6616e5782bbbbc7f4916d9641f4d70335ea810e7b5b0fc3
font_03_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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