Malicious PDF — malware analysis report

Static analysis result for SHA-256 8117e74aae1d5f5f…

MALICIOUS

PDF

85.6 KB Created: 2021-08-13 04:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fee1a3f7379be124a8955979579d4be2 SHA-1: 701b0081e99d45c117b1ecebe2f5e765e3f5895d SHA-256: 8117e74aae1d5f5f6675468b53f8b6b6540c3185f48c346051b8e41a6edcf702
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple distinct hosts and the 'utm_term' parameter in one URL suggest an attempt to obscure the final destination and potentially track user engagement with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafcf95785e---tekevebi.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0778fbaa0c5497c3defabba05c4802bc/zixerewibesisij.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c136e3c9---dezenezujivadotaneguxa.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/lafezutaraxomag.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/69328003445.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a884553ac2a---kavepujetuvugisa.pdfIn PDF document text
    • https://digireg.cn/upload/rotib.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7ci26ldq7trt90o1k56n4m66v8/febupalepizilebego.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/20501316378.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/2742019696.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/87198055771.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160e727f4ce0f1---51619502054.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95e129e42---2115580444.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088169f71a95---poxozefirunewanu.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60971930927.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/foliwewemijifolew.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/wivowidoduxotakadagogo.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/95439534689.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160799d2220df4---dowupujesi.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/salojuwixip.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/13474982656.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/97212155460.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2951a7ea0ba712330519c2a53a4407ee/nevoxenubogikufodogi.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jexijibopobovizuxogesubet.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/tawiro.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f45f53103d---88243130489.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4452317e6895c289f14d6c2b7dd5dd30/kefulomifivoxajos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jigsaw+movie+download+in+tamil+hd+720p+tamilrockersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 11488 bytes
SHA-256: b42d0cfe06234139f774f097fc21e2ccd52f291518f476ad4873306f1d117b0e
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 17284 bytes
SHA-256: 4fab4cdee590bb98f42d07ec15a25069ef00bc07e3016355ed608eb6773134e2

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