Malicious PDF — malware analysis report

Static analysis result for SHA-256 d629545ad2c2e7c6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-17 15:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d134f5656e72875d88cdcbb867f7a8ad SHA-1: 75588f7bfadeadc8a1b5a8ccd7c98222ce07ac61 SHA-256: d629545ad2c2e7c61f73ab488b02bc7375c09a8f130c2b27d92349b624243aef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. Heuristics indicate these links are on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=exponential+property+of+equality PDF link annotation
    • http://www.bash.cl/media/file/xidikef.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/runajes.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/82768904900.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/dipaw.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/61390728197.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/runesefetuwaxigufesefaw.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/telosok.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2cf15f46e79a7a05dd1824c893f4f8b6/mufunewege.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/duwowelab.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/fukilibi.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jaxiwaxa.pdfIn PDF document text
    • http://twilaw.com/files/files/94002811032.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/94162399907.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/vojubevawaxerikedudo.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/51262669959.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/21600341836.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/37588223448.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/65736838445.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/tanedit.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/gupenofavebedi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130771b648da---kogerujajax.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92c1532d1---17741400305.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a22da73a75c98a6f79adc8823d89446e/85092544954.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 10628 bytes
SHA-256: 762021fd273e1035f4bebc69da4ca3ab314ff15081ced478d4f75e6ca950fd06
font_01_sfnt_off0000c8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D7 15592 bytes
SHA-256: 6d78f3674e4bcdc3dc3267ce235a476d98792bcc0388ddd9d52c6d4b537dbc02
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1