Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa8602557351da7…

MALICIOUS

PDF

83.0 KB Created: 2021-06-27 09:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c9879f35e9fecf5bb2ef1db391d2659 SHA-1: 885bdcd791ada1cd02aac267d1a6f28c5bc79c5d SHA-256: 1aa8602557351da719ff740c9702bb9d101d01f2a60f390def0ddfcc29ec9bc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ee21748a6fb6dbea1b9fbd8c76a82a06/83512003079.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/20461543958.pdf
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/75116087160.pdf
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/vasazegukopofaw.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/e6846a346108cf7159d8b75d76d78282/49851224488.pdf
    • http://amphorabeautyclub.com/campannas/file/wilixufez.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8565e212e---85640688831.pdf
    • https://mecaniquekd.ca/upload/file/zinebajogevuzaninofuteke.pdf
    • https://xanbiente.de/userfiles/file/nopelidilurokemov.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5bb6e7f5a---58565044944.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mto99luifti04ueg8cpf3mv2gn/95827738359.pdf
    • http://lucann.com/Upload/file/sedinixonefekunig.pdf
    • http://praconsulgroup.ru/pict/file/laputogugodanakudabonija.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab94f82220d---jowapawep.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e9bgtrggc909914asdn1itp3df/41453327415.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2ca0cf8cefc0906b01d11a6ae7c0316f/95963002917.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/92357262051.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071c381efe01---15149328286.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a40fc57613f---korilat.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0cf68a00---99581899813.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/643a3889d904f74e39a45da777f7ccad/fugewiruboxaxorera.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qplk4dm5cu8h7uv7ahm2uhrl86/52345136472.pdf
    • http://lws-realestate.com/userfiles/files/roxexotoripupolavikenad.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e0a3addb---41288630605.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070749a249bb---89863292090.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=complexity+limit+world+first
    • 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_off0000de3b.bin
5933417cf715d5037b291e8c94075b0bd89581c9ac8923b28840103da11005a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 18264 bytes
font_01_sfnt_off00010c95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 16792 bytes
font_02_sfnt_off000124ac.bin
95e2d49128cf07c19da105620654b1acbe32d23c9f86bf3a295d4c7fee9d9cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 10724 bytes