Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ca1211f7d0f6d5…

MALICIOUS

PDF

86.2 KB Created: 2021-08-17 20:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c5cc2c5f6f71e12b1cb35126b27868b SHA-1: 441d44acb19fd9dba4fe82f5149719e2932b28c0 SHA-256: c7ca1211f7d0f6d553c0af301b66d7a1b8800990b3e5d7b364c9c4b3e6061cc6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://chcial.ru/uplcv?utm_term=calendario+octubre+2020+para+imprimir+pdf PDF link annotation
    • http://asijskepotraviny.cz/files/file/miziredijatapolulazedagu.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/63318544050.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/josumokelokugunuw.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/xixezewunax.pdfIn PDF document text
    • https://fallsplat.se/file/sulonapodugo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62400941275.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/vqblojj519tnokncg282f1b6ql/30580343406.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/vujiwapekozidila.pdfIn PDF document text
    • http://skomi.ru/img/files/file/36086699049.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf6d253c5---duroxeb.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/24790310316.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/473449b0f0c739a5f975c461359dc505/fatomuxudatoboles.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/gawesazetiwux.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/15222720137.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/lkm8h2c08sqbouetgtftfpr444/962910949.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/466fd8be063feb546de79f1075df0c19/94923852338.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/8664253603.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/xagaxuva.pdfIn PDF document text
    • https://led7.ru/file/16245394601.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/falelipafarabaxagonole.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/derezifefumogafusugi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dec7afb95---93337119118.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/810458d5d76c43d2a3821ec824096467/91095258118.pdfIn PDF document text
    • https://grandegroup.net/files/bapimasabirobisad.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rotuzew.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082649cbb55e---loludonapatetoxakubolaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 11128 bytes
SHA-256: 53c637a0532f5dd621091c684149530020518c60ac6dc274aa9b0d081b52078a
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 17628 bytes
SHA-256: 95d98ff06e1705ec24162a7f5d5099725ec6c711606400ebe22bdadfb98672c3
font_02_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a

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