Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dc74809d986d45…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 09:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 193d421241489ee55cb9da497f00ec57 SHA-1: 2c08cde8049f34b40d57393cd5761de5e70dd547 SHA-256: 23dc74809d986d451b7fee4f997beaf540a5525e15fea9f663f6d0445ad1620e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sluganarodu.org/userfiles/files/jesibabu.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/251dec114c6a688a9741107049436f4a/liromeramidiru.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef13efe2c---lidaxew.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f17ca8c7---20851589934.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0fc34fe24d44c88e9b63f0556e9b01bf/laped.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160840a010d256---mirufifepijiz.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/38112362327.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/166f66c904474e7674948d107a7f3d10/vomikomat.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pemukujotusofeno.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/69897802346.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/tv97ift86b9sdji7jffhgq31u2/senazukajifijasosudiw.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vchel4qrfei4e09dn9n32u87iv/bipase.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/musatusani.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f0f045cf6---garisikige.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6a3fupfi05l31rq6auhqml5387/suriwe.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///kufudidawetagodolutub.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/98987444869.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/nodadotawow.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16098d131892a6---zalaferaje.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/66503472572.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54030746499.pdfIn PDF document text
    • https://apizf.org/public/file/62090200311.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/18410223741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=activator+windows+7+professional+32+bit+bagas31PDF 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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 11464 bytes
SHA-256: fc3bdfc3a4e354677273015c7054f97c200599ce6b49f00f6234da5b8095fd1d
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 23184 bytes
SHA-256: 3de7e03ece5443e35d63e14ee704ea37c028429d9326d675a7efa4ead9ec42cf
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1