Malicious PDF — malware analysis report

Static analysis result for SHA-256 623847eb2c892b38…

MALICIOUS

PDF

89.7 KB Created: 2021-09-05 02:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f218d5413e1e87f9fffe426a4c333edb SHA-1: 987c93547005307b2a8cfd247481e0ac0fa8f26f SHA-256: 623847eb2c892b383d36851cf1087ffa26d35840e7355ccd5eef4377572f8167
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://deitratech.com/userfiles/file/86711156950.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec12345340---50284659549.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9734ea043---29486753145.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/viwodijibanajigiriwi.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be23005c0ba---depekidajebaf.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/lewuseduwul.pdfIn PDF document text
    • https://drlanda.hu/user/file/35750588553.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/59vbtbhlpr754kor57q9vd8s8o/33370123479.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/62425561132.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54db1dcc9---69360493545.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/59583263626.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871cf7f414d---42398780619.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/59138287626.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/fituju.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/80358826aee3fc2f4c5144eb9ce9718f/xegegigegorub.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b4f21a60cdd1f212113325a85c02f5cc/82425179408.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bc53af14509---56146806310.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/28584372156.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8fbe7bf0---gojenuzopuxozekopedezilu.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/560536185.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183cfc49174---61589595835.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160754879d6d11---dotowuj.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/sivivefekimosagozar.pdfIn PDF document text
    • http://cochu.net/resimler/files/zapuwidewizironerukova.pdfIn PDF document text
    • https://drsoleimani.ir/userfiles/file/tuxipotonapur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+ford+fiesta+lx+2000PDF 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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 10784 bytes
SHA-256: 0391592899f4e428457d297cc98c197e44248ee3109a276b3df4e70d07af21ed
font_01_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 18656 bytes
SHA-256: 8818d44ebcf3386a4bda13385b553e8789ddacaadb2acb22ee68a5eba9dbbf46
font_02_sfnt_off00013fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1