Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bdb1912be555f9…

MALICIOUS

PDF

87.3 KB Created: 2021-08-05 18:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c22328fa7426b80afd774ccf55635c1c SHA-1: 6a0382116f7ed62e88f2d160c2eff48b7348447f SHA-256: e3bdb1912be555f9fb3d7f1224163641c284a6865901eccd04bd003f507b2e3f
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various domains, including those hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garglob.ru/uplcv?utm_term=new+destinations+level+b2+teacher%27s+book+pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/70297854361.pdf
    • http://darienhigh69.com/clients/866565/File/44569032017.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/lovigosufuwosamewolof.pdf
    • https://cuisinescartier.ca/upload/editor/file/vidikuxuviziw.pdf
    • http://premiumcsp.com/uploads/files/33262501706.pdf
    • http://inwama4.vn/webroot/img/files/vitikofereruletege.pdf
    • https://amrapalispot.com/userfiles/file/vepumuxirowun.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b335ced2fb0---memokilorilinato.pdf
    • http://petra-dario.info/upload/datoteke/24632776827.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d64fd4bd9---90953522838.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/08eccd71c3890a4d9e8b92065fb03bd7/56972752520.pdf
    • http://sibinetweek.ru/userfiles/file/zasemalipewobas.pdf
    • https://alshamiltrading.com/alshamilfiles/file/72056697327.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rlf29ej1n3dvqb8kk0erqr283b/65625575711.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a6527ffea---vutolo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f63137d2a0b---53798879768.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/revobadejimez.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/cf1739566a4364d9e66b3f2356dafe64/29861408539.pdf
    • https://aymfly.com/aym_image/files/17961967212.pdf
    • https://ajitcoatings.com/uploads/70201743006.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/xemoluvideferolufupovada.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1f064618---josuvufapusiranimodesap.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/n5h19986glas7il1nch31p08qt/11809061893.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11de9ac17a---66132511603.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_off0000e0db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 16792 bytes
font_01_sfnt_off0000f8f2.bin
504cb7885b47a5a0718c245a0a4b1643d3d12b2d2b4d86898f1fdd1804863aa7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 11232 bytes
font_02_sfnt_off00011326.bin
a5fb7648d4726e2306a867963f0ba96274f3388bf7fb75a691e5becf401e6a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 23040 bytes