Malicious PDF — malware analysis report

Static analysis result for SHA-256 d406a8ecfc5f77c3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 11:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d750e69e67f2d0b3a34e0feb5048459e SHA-1: 3de07dc7c98d7b22ac2513dcdb16850d21614c05 SHA-256: d406a8ecfc5f77c3818906ab5c30e4442cbbd5967f7405cae5f57194b9ae3f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious URLs. The primary attack pattern involves luring users to these external sites, which could host phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrapanel-alegjobbfutes.hu/userfiles/file/13509110229.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/tinuzubunuledapaduxugabe.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d9251b0b4451d3840f3f5fc34ae18068/26913642520.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/buretobavoniwijoworinob.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/xamowuwox.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d164165eea---25321249919.pdfIn PDF document text
    • https://777mto.com/contents/files/newavilojekub.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac402b11d3---92768630729.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gixadurawoba.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/71137610257.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/4264942409.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd9a581a0---tesikuduzigetepis.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4047490564.pdfIn PDF document text
    • http://amrapalispot.com/userfiles/file/16654550371.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/83008925784.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/73317733848.pdfIn PDF document text
    • http://hodori247.com/uploads/files/36287858125.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/54328114362.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/699421b19281b1b10540e4eb1f87fa3d/39359541525.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/35827514876.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/31202692046.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec097482fb---lapusodadu.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/tufifoxaboxegix.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/rigewufubal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+holy+geeta+swami+chinmayananda+pdfPDF 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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 17256 bytes
SHA-256: 7011847f87014948e530cf2ef681422def09951f7eb71567050d94963d29bee2
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 11132 bytes
SHA-256: 1a7b261b5fb47f3ce53605ca0ec336df9d4b458112f9a0e967038764b958f891

Open this report in the interactive analyzer, or submit your own file for analysis.