Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec50889c769b156b…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 06:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfe19d6d02fc382a83b761a0b0530237 SHA-1: 9034c5352c0b27a4442f83b85dc336517cc9350f SHA-256: ec50889c769b156bcfbff9add7d38e501ef25c148a2090d1e0316055de333695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://alemotta.com/resources/original/file/laxirebejafudigalowadupiw.pdf In PDF document text
    • http://martom24.pl/martom/userfiles/file/58680435451.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/mogulutix.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/sezezuwego.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dd8dbfed---nifupavipadiwalarilonej.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/54feb12efc1f583b72cc0c0cc1cf643c/gaselisedi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d22d6d5046b07334b1f8bc5e5821e961/91983070080.pdfIn PDF document text
    • https://andrejc.si/files/file/gidivumab.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/gubakazufoku.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/xezonoguzisokuzadebus.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/62574017828.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/120351272.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c431e3f32b8---51869317318.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/60243070751.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xugopinojemiwovuvuvefula.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/81ba8078f18b40d2ef238013c86ed7b7/84772112229.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fkr2unphuphu4i0dstpch59pm2/47326916452.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/lasofoz.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/13700728278.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/wikisebubidabinuv.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/jaripixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=twilight+saga+2012+full+movie+in+hindi+filmyzillaPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6ca45073d4bc6becdf11c526190209c0/lepujov.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16404 bytes
SHA-256: c30b9c0947f485537948a31ecf8b766436afcd4d6e3589445cc0ffd866917039
font_01_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 11384 bytes
SHA-256: 05b1d78bbfcff45bb31002d547f6254935ee7465a7986f7bca09bf21656ed9ab
font_02_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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