Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eef00a5f39acdba…

MALICIOUS

PDF

87.1 KB Created: 2021-08-01 13:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a13044f9d2f386f75edb2cd43b793a4 SHA-1: c8e17b4461fa615832c685982e026048242c3b14 SHA-256: 7eef00a5f39acdba666a011ed6fb4495fa9066bed194372af6095b77290072e9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of these link farms indicates an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c3ae760---xowumomakuw.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080edb266b62---gebavutudiwiteg.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/sajawajowibo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7174cdbfb---42170797520.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/kalepexamar.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/leser.pdfIn PDF document text
    • http://podushka.by/files/files/79862264994.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d9b32233196148259dff9fd72683228c/mutarapof.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef3eddb4e---xibig.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/bitafefo.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/51332271977.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/70818221943.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c59048a5809---78036613769.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/jozikizunotalatojogofugij.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/45939254639.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1354564cfd---toxogepewipamosuwizis.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/jomalowuweneridexozemixo.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/paketobujexoziwiwifaf.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sarujamapulojuwije.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4911a6d66bdb4b792c0cf6ec588cb8c6/dotabigamevakuwifetifejup.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/62462277560.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/3619865477.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/404dfd384fc46f6af0a245efbac8bbc3/xukopigudovururo.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/surolota.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/67022419822.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/bobadelivawelutesututege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+clean+your+keurig+with+vinegarPDF 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_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10788 bytes
SHA-256: cb65b691ce4c424ee0499946a1d3fb7d1e159aaa109ee80076ef3277becf669f
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 17308 bytes
SHA-256: f7af20a75011ad90e44cbfc057ac75dd52c967e89bc34aa14d4e39bfc88adacf