Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8608042fda25a0…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 01:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fe12543d4b5fd7e4b7dd0965d7ea565 SHA-1: 3453c37f82eb1b11d9ff493581c80b744e9e25ac SHA-256: fd8608042fda25a06f6caf3a0b0aabd5676b742255008addf5457668b4325b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to external sites for further compromise. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

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 http://24cvety.ru/upload/files/fetevomedasiretirub.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/lavugozevinegekol.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/99924906293.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d77c85c5966e67ff2fb4b12e0e07ba29/xepilateritujegudigari.pdfIn PDF document text
    • http://abnicum.com/files/file/52341485247.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/futanedu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c8vvm460nfqrhfqca9a9as4gq7/mupalobuzin.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/77254386624.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210926155945.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/8083935934.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b1b11d68---15657129176.pdfIn PDF document text
    • http://elpijisystem.com/file/35061386935.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/72635431448.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/22622148521.pdfIn PDF document text
    • http://expresskaliski.info/file/16166859542.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/guliz.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/mugow.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20211001_D9D94CDE79361FD1.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/kq7gj2vvtera6r37ahrjahv8bn/sepujumivatapuman.pdfIn PDF document text
    • https://soechi.id/userfiles/file/gujav.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615758a1bbc9d---72986210875.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/5408271267.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5bb5ad99b23ec5b51b20c6e79d8b97b6/vezome.pdfIn PDF document text
    • https://armenia4d.com/contents/files/sevakulomafogukama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pharm+d+students+have+stethoscopePDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 10808 bytes
SHA-256: 2fc4f23ae7b43851c019ba8891e2be9d0e87702e27d1db7e552115bf9e005e7f
font_01_sfnt_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 16876 bytes
SHA-256: ad8b9cbd4e16cf4318e8bbbe5fdd821fdf1cef64a114dd00ba98a8c8dd26a294