Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5dad8cac02fb90…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 01:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 388107f637fba42fa1bfe5cb66f660ae SHA-1: 5260b92b6b2a33e18840e57ab2d9d36bf896d75e SHA-256: bc5dad8cac02fb9013679b3155b1aab1af71ffc276508c005bb585dcca90c717
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/0db7ef3a18e60f5028546ccbbc14ec61/35140188747.pdf In PDF document text
    • http://worldprint.su/userfiles/file/24336665313.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/nejorufamodetusoxox.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/p7q2c360m4i9oftlc9ojtrkhcb/26380398060.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0t114dnvluple97q8mqebrdv70/xoruxelojeduwogi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/77e0b5ca407a2dd811e071e97829ad7f/wadoxuwimi.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/zoximaganozowazufilil.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/xunurebaj.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acefa3e7f7b---83596464025.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gomesex.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/torinonixagujojuwabap.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/789349d9944859ac7985fab110803f80/10147236928.pdfIn PDF document text
    • https://webmenuplus.com/images/file/94743226482.pdfIn PDF document text
    • http://mousike.it/img_ins/files/67963157273.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/47767655619.pdfIn PDF document text
    • http://camonetinternational.com/files/file/28818148299.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139b5515ed4---soboroz.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6cd3baf12669da2cc851c2c7542466cd/xenevamufe.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/88833852954.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c95b0413---12666428681.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bojuzapinopuxogetula.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/15729012591.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/rewulifopavofa.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/dibefojobar.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/zeminumasumusurufinafopi.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/24453974346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=complain+meaning+in+teluguPDF 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_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 20576 bytes
SHA-256: e0175becedc9d0f8e8e0a1373c0a9f2f68e4c9781e89b3790c96824df942a97c
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 10460 bytes
SHA-256: 1a74baf906dd018e26e62792ef2b8ffbda00dee6cb33250dd5ce3fa6cca4635a
font_02_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1