Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ed688ec5ee0beb…

MALICIOUS

PDF

77.1 KB Created: 2021-06-25 15:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b160545b1ac9dc2f474b8d4b66467de8 SHA-1: 3f6d7665fc6b08e920375f9fd4f4b15c188d25fa SHA-256: 90ed688ec5ee0beba1bd68987cadcd84dfc53a2c911c1e2e32a02fe65952d3dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download a payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://washchienluoc.com/upload/file/perawogakefa.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0d8c66d7a0bc0cbc136df8cb89891dd1/zopifewejixovusow.pdf
    • http://meteosputnik.ru/userfiles/file/27493760000.pdf
    • http://loveperfectionschool.com/upload/file/venoravobovolamekiko.pdf
    • http://adamlegal.com/userfiles/file/vamisavubuluv.pdf
    • https://samarpanbharat.org/trila/userfiles/file/fonifesanag.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a518fa8d815---pegifutaturepemuzelas.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbcddf91b---42183889015.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2887b93bb4---85376657688.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160784e39cf96b---samixagebamudapaferi.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ra8i8v0q0lp3cotrjo4nfsut20/21468862874.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/lasijafisukut.pdf
    • https://emilline.dk/ckfinder/userfiles/files/9973873761.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/af432aee79799b635d0c979830ae6337/80702270587.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ccca121a95d---63762889394.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bed+previous+paper
    • 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_off0000ca10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16792 bytes
font_01_sfnt_off0000e227.bin
3597aea426e640949d89f5afa4448fdcd55dae072eec79ec17e23842a0c1e5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 10356 bytes
font_02_sfnt_off0000f9b0.bin
9ea105e9e6bb241260bc9521ba137ead7d8ad408505849d34e97cf8da3b48eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 17076 bytes

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