Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cce9d27084c3e2a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 16:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 927431b12344ad6c1618f4016fe4ffa4 SHA-1: 4c0c413562e0804de66fdc52eb7298cb9be84b4e SHA-256: 6cce9d27084c3e2a9fd7addad18e93ef2739a809924c623a3bb324852c6f9933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress upload storage, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tailormade-sales-marketing.com/userfiles/file/79701134678.pdf In PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/vemagivivajepufopala.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ab5791db---mokobutuxugozox.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/47691930434.pdfIn PDF document text
    • http://njxinbell.com/upload/files/92589587125.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/76329498946.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/fubafefe.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/92190300605.pdfIn PDF document text
    • http://koutingchina.com/upload/files/tugogolibozuka.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/dolinulalotuvas.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/61139307509.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/64520481423.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/gidafidip.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/25309919141.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5ef5e9f6b1e54298543892ed6eac7ec4/90575966886.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/57346895543.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/moxodezukejatuwedepagixi.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/85929358810.pdfIn PDF document text
    • http://stefani.cz/fck/file/6898626687.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1048dd1bead6c05d0538786aacdf6460/filotubigamuf.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/xerotorarevozutiva.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/51035542615.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/44077722966.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901161003977286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+file+game+ppsspp+narutoPDF 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_off0000b902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB902 17628 bytes
SHA-256: 21dcd87d2d4beb8f894a6809cd3e99f1a653878d36cb723a012aae5356eb518a
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 11028 bytes
SHA-256: e273bcb1deee7f5b8c7470ff3cbbfde976befb1f09059948079372720d332f12
font_02_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1