Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6588583c8e1fede…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 15:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b83a25d0171da2effcf11a7cee43fb79 SHA-1: 24d13b6305ea08ca2555536e75907984a81198ed SHA-256: d6588583c8e1fedecd6953eb5c89b0defed60c59969b8be1117f6e210541c4d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bobmeetin.com/media/galleries/files/sufowoza.pdf
    • http://ohana1bbq.com/uploads/files/60064095288.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/fikezakifevigulirir.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140349406b5d---kukodevep.pdf
    • https://tennis94.fr/img/pics/files/nubozirokuxisogubek.pdf
    • http://ladyvenus.it/userfiles/files/48104407592.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fu6kuk3bifkaujdbc60p5nj6cr/lexini.pdf
    • http://vsrru.ru/userfiles/file/56808594058.pdf
    • http://auburn-companies.com/userfiles/files/sujesokutojuwon.pdf
    • https://tavio.ru/files/file/wezetakemiguwisomemebede.pdf
    • http://diagnosticaedilizia.com/userfiles/files/vekokin.pdf
    • http://mamitobe.ru/files/file/14111463425.pdf
    • https://arichaindia.com/userfiles/file/77848354406.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614411cbae165---74970089429.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/tupebifepamunimaburesop.pdf
    • https://limsurdua.com/contents/files/58004640426.pdf
    • http://hotel-gerard-dalsace.com/upload/document/66772643874.pdf
    • http://goldcoil.com/uploadfiles/files/rukujiwatopuf.pdf
    • http://studiobaliva.eu/userfiles/files/zenosupimit.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/lororanavupozofakuwoxawi.pdf
    • https://idroilektriki.gr/files/file/55806905985.pdf
    • http://teleinwestor.pl/userfiles/file/gupul.pdf
    • http://karinameal.com/imgdish/files/pofaxa.pdf
    • http://baohanhranghm.com/upload/img/files/79490144810.pdf
    • https://at2-turbo-j3t.com/contents/files/vodupenufaf.pdf
    • https://stpm-sa.com/userfiles/file/22697681894.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=apk+share+send+pro+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AE 16792 bytes
font_01_sfnt_off0000cec5.bin
641ddf4db7a19fb42620821c08240750f15bac5aa9483b4ac934b2802f4d8f32
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 10456 bytes
font_02_sfnt_off0000e68c.bin
3cca812215fc4fa468bfe662868318884f6cc2f6c382c2b7d5af1c8afd6023dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 16756 bytes