Malicious PDF — malware analysis report

Static analysis result for SHA-256 23df47c637afefdb…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 03:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 67cac8cd665846dbe4cc6344f6b64579 SHA-1: 36a2189a109469bd87fb577fff5db9b842f2c30d SHA-256: 23df47c637afefdb396ebace940854d1def3bb177a8bdc2148bb3ee2e2357cf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3321a61cc6798d4c5c1eade23555c375/35732156532.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/5389142070.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/97103438339.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6f084afe---webimulev.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/48995523846.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608065173786b---47725877438.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/85402806662.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b485b42e3---vubedixaxogop.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5922272c726ee2751ec9716851e02af8/kowosuzivabutafamamox.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/dinaxojekileketu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9f837bdf---belabo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d1e83e74---14115892298.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/8914669442.pdfIn PDF document text
    • https://autopratichesas.it/file/teleleninileruwelabamope.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rqoms1a7ket9jkd8faud89gd1e/vufex.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/63354146506.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/butafikapuximumomexoxar.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fcaae97a3---35745117698.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/88418172239.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c521de8846---9362920486.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5661bbc31fe20d3be5263766ebd1e107/77294855734.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607021f0268aa---bosopemapipuzumekokowusit.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/pesomusegotelorelap.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vhi8fpagjqsn9hpbjedj1rr6i0/jezena.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4nhm2d6nobhvr0qepran7ms397/luganivog.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/judawiguka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+new+year+wallpaperPDF 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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 17456 bytes
SHA-256: 9183c9c9d9ef189761b0d9c13a2c9fcfd22bc09487f3c71770abd8695af5f9fc
font_02_sfnt_off00013e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9D 9944 bytes
SHA-256: 930b5bd75ee39d432c4c033687d68d8bfaba247569c030c177227759620c2d4f