Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f841a9c1c0dc2f5…

MALICIOUS

PDF

68.3 KB Created: 2021-09-10 17:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6df2abb139d11f5bf4cecfa29ca6aa8 SHA-1: 814d96d040cea8bd7104ff73278fdbb6867b6ce6 SHA-256: 8f841a9c1c0dc2f5f402b2eddcccc1b725de7e6271ca9e2b60bb6ab3f101fda2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The presence of multiple external URIs and link farms suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://smidgel.ru/uplcv?utm_term=b+minor+guitar+chord+diagram PDF link annotation
    • http://print-resource.co.uk/ckfinder/userfiles/files/26027460446.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b7a9fdcc166a99fe69210bb149c9f8e9/44024783299.pdfIn PDF document text
    • https://btegypt.com/file/bosujoduxifujujutofibol.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161385feee45fb---wibewapawomu.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/rewurofek.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c656e9b9dc1586a11564a6b5de9786ad/19570066577.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/tazifutud.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/logememukubogowutadiba.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/23571296457.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sewowosisulobusulak.pdfIn PDF document text
    • http://sung1.com/upload/files/99819852475.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/rekiziwumekim.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pojilokeworirutu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/92577219408.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/88505709016.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/66341365011.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/573ff45661a208a2fb80ae7432444d11/51076142053.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/wafenafarunojoririmisi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/26375987829.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/koguziponafataxaf.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/52188326077.pdfIn PDF document text
    • https://goodline.by/userfiles/file/mapam.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/96017932199.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_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 14332 bytes
SHA-256: 0c613b12574ea2ffa36dd725caef0540d62820e973178ab7ac2e618c3548fcdb
font_02_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 10624 bytes
SHA-256: 372c5b6674266afbce5c4c5fe97f15624caec4aab0333540f4216fcac5e1ca06