Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdf79ed2eda9083…

MALICIOUS

PDF

70.1 KB Created: 2021-06-25 12:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8ea1c09ff2779ee4610cfcc8c62d6b3 SHA-1: 791ab76a3700960773489e218422fcda293b52a9 SHA-256: dbdf79ed2eda9083a6e18c5c509646e8e76d7f6ebd2134fd266265b1b99ec392
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to malicious content via a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41950f2f7---netuzijorexiduxafaje.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/vizudogefekuxekuso.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/3d59b59befdf364da946776ec10e0842/61453345123.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7ci26ldq7trt90o1k56n4m66v8/febupalepizilebego.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/12827219983.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed05f00937---54138077375.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fbce472b816a9705e2ffd5f24c9e5f0f/wawuluz.pdf
    • http://conblocmanado.com/pics/file/92308436658.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b7409f03---beduzobagofu.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be133508c89---rudajuloripogaguv.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbfa32e626---lumumufip.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608503dc9a91f---podogefufutijulo.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a423cc87633---67787530054.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hockly%27s+insolvency+law+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1af.bin
d100f48f9d40333bd95f94912ef413afdf5dfa31bda1a41633d6e19ff34986ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 15812 bytes
font_01_sfnt_off0000da4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 16792 bytes
font_02_sfnt_off0000f266.bin
24dec355efd5977749683cfd9a44526c65833923950cf6bbfa3f619c4f5cf27b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10900 bytes

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