Malicious PDF — malware analysis report

Static analysis result for SHA-256 34405d769d856a67…

MALICIOUS

PDF

86.4 KB Created: 2021-08-30 10:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8b18f85b24a91c799d46af5674adbf0 SHA-1: 24194753aa83c5882d916aaf5e0f41ae9a3d63e8 SHA-256: 34405d769d856a67d7ff680ef4edca09c0ba98f1033cb4da0114537a6d3d2778
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=ruby+made+of PDF link annotation
    • http://www.bash.cl/media/file/mapomusu.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096011dea210---62839710766.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/87345922957.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/tibolawepivetameju.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/jiwinof.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/27329472213.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/25611047519.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa29e98d1---12771991823.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gapipurenofogedivi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a3191f820d7764228f39ab780742dded/vegurojaserizewobopefaba.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607812a253b1e---ropafaniwamusaruvelinuroz.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611454d7971c5---85477525484.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b328df54---97928987508.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202108131544145064.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/64783444694.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/56358723475.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9af7d5117f8a3ebff35b9d85c8437ee/40092493846.pdfIn PDF document text
    • http://bakoca.hu/files/file/mevoruwaluxepepis.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/16778021776.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/23381319513.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/60022b6ccacc109b0d7c69c94d509f22/79956782146.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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10308 bytes
SHA-256: d1398b3a15c4b9922b99b195e69a81539bea02525e327dd443ec00601225c60e
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 18020 bytes
SHA-256: facbdf08c77630d8129673e062f8b5a2a0c9ee31c2ad1bb6492a991952e3048e

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