Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a362ab8b92dd01…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 12:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5623087dd14c8d9ef587933f77a0661c SHA-1: 33719a61ce7d12b09e0c1be0610626950071f053 SHA-256: c9a362ab8b92dd012933dd67fa6bcf69492d657745bebde1889a47eb1802ad5b
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous URLs suggests an attempt to redirect the user to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://shengnabei.com/uploadfile/file///2021071005530010.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0b4f528a32b30aced853e291be4d6a91/bujuvenojomijuzolenoser.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/jodiwimadodevuzusoja.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/51034696958.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/25315365686.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/81196172528.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/kobemuxunekotigesodewufa.pdfIn PDF document text
    • https://kaimano.it/file/kazalanisexorubasular.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/lewigetebave.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ac643249325047a00db99c282f007690/jupitegapizusadaz.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/41580511169.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/75417308530.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/g5ldhu2ap85pd4jvb4na6nv7de/begujet.pdfIn PDF document text
    • http://hk-keber.de/images/file/dinix.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lotuvarobexunizeg.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9cd3ee7f---17726369576.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ababc3a4daf034883c896583881c58a9/xewovifebiwojupozij.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/lujidezobev.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/wezujifax.pdfIn PDF document text
    • http://bamor.org/userfiles/file/22021370138.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c531c7a6112---54387741671.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eccb447aea4---55697722206.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa24ee08e5---22633821429.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3s7957jk595hv7ceqq6fuop16c/sititovurezelad.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvr6reqnop71deta27uau4bae5/siderudarisipuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=manual+inventory+system+definitionPDF 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_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 16132 bytes
SHA-256: fbfabb83fd699aa35e481cf011b42fdd35583c12ba3a03b0068e4cccd20865ea
font_02_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 10788 bytes
SHA-256: adc7ed157a7c73dcc360f8d84ad266b0e405665530e99d04b1eed7e127ae81ed

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