Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5891415347eb92…

MALICIOUS

PDF

89.2 KB Created: 2021-07-04 01:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 347c799ea6668820e12eda3bc191839c SHA-1: 4047c9626b79fb83f7ea30189ef1fe760470fab5 SHA-256: da5891415347eb92d5b66dc68bce4cb205c9f673ae9b089fbdb6d8ab17aa0681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=inflammation+in+my+knee
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2d81f3b324827be85695d4c1277076f9/97082725976.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/80948523829.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3493f65b---41775668998.pdf
    • http://daiichihr.com/uploads/news_file/bovuje.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ef73ab1---bozofowatebawiwabure.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/selagalepodiniwekavi.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d9a3bab70cb8b2f7492d86f9c8197d83/65149647709.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951364178c1---23563352199.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/29257040199.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608080eabd88c---42697866127.pdf
    • http://infrabud.eu/fckpliki/file/kodusetire.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfba62f03d5---popazusinoneruvofot.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02645e18a---renekutetavobarusofun.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/7b74a69df333c821ca4d1ea795faaf5b/pegobuluvuxu.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d3277a4706e---50451482348.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qukk5pjas4hv3395us0p867cp7/66379472745.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/panumazadi.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c596c0639f---65756298059.pdf
    • https://thaiwoodengames.com/files/upload/files/82590789819.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l387008eheeg1r95ubub7ivj74/zopojabuxowikul.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kij7h8hvfnufch3ff4t0hop7q1/kideporeluwo.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d59b6191---nexuvexuzumowe.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/talidugimi.pdf
    • http://bukhatirhomes.com/userfiles/file/48876586567.pdf
    • 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_off0000fdb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 16792 bytes
font_01_sfnt_off000115c9.bin
ca8ddd0cd8ae973c3fd7b091cfdc9e2b14b62ab0148ad028d2be19ee01e22780
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 10264 bytes
font_02_sfnt_off00012cd7.bin
19999c2db4ad3ed65d0b5aa20d48d424ed0eaeb19f5dd923eac5679eb5f8c5ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 16612 bytes