Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b446d9a31cc8da…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 22:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32e60c5cb6996961884201f677bdeb76 SHA-1: afbd89e470af08161d091c6271f99a992e488bb3 SHA-256: 10b446d9a31cc8daf1d83a528aeaa8eb5309c4a82029dc137d0970fe11a5b195
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://noithatnhapkhaugiasi.com/luutru/files/garisurav.pdf In PDF document text
    • https://luiginoiobbi.com/userfiles/file/kelekonazeruxisiru.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/88727806090.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/195368356613c13d482586.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/82420188680.pdfIn PDF document text
    • https://hobbypet.cz/files/file/3615894668.pdfIn PDF document text
    • http://didopack.com/files/96425251185.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/79d48f42c79c7195fc30d2f835f7e2d9/lepidokis.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/tupitimokexewaripibixix.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/92341465824.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/67103124898.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/71165531138.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/worirosipemijigukiror.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/65945586915.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6e16559ef---gavovezawuligisikusosuk.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/puxofojolowini.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/68107617499.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/48665893364.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/77048000239.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4253d4476c4b24353080a684e9cce78a/dugobufitakiw.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/48698612578.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/36875549353.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/nezopotimuje.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/23053782514.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109100103001469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+connect+phone+to+mxq+pro+4kPDF 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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 17836 bytes
SHA-256: 3f8795a182548cf0683d17b24d7c1503c7af026441d0acc2428a03ac91770dad
font_02_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10664 bytes
SHA-256: ced1b9301376f866353b08992300667c4fc4d068f9fd2fa94b78be34d697fe96