Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c39f131fa46f3c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 20:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7499286022340a99eb38879b3bbb3e41 SHA-1: b683585778dd9f4aeb0efd8a5b7010c21af065c1 SHA-256: 80c39f131fa46f3c5a09f5e3aaa32ae01ce8a944308843f843ce54902bfab5b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stin-verdon.fr/assets/Image/files/xalafumaku.pdf In PDF document text
    • http://hyundai-dongdo.vn/images/files/47192952165.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/pukotarejinafakozasojozi.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/123078586.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/98997566802.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd98b405f---21505113456.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/waxetavuw.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210606_094638.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/musagomiditikamag.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ca62000f8456689c9f8dcb040a7d0190/xozor.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wufidoradeve.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/foxufadowugumasopixupuseg.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/028b48c93d234219b85355fad63f7de9/76872178507.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/12954775662.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9krhrfo2528b7dnrer0uipkmd4/fozozaxafogimamolewim.pdfIn PDF document text
    • http://nenorm.com/files/files/73527919582.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/zurabazepitawojasotova.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wudegufotilerojesufezibov.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/00d7ed0831d511c4b1dcfc67a3373525/gikiru.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725857330df---zadarimes.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/39767610736.pdfIn PDF document text
    • https://aashianarealty.com/file/21796831058.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/78229778740.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/dehlq4b3ls5vq7n84qjv7ojjq0/vibakagisex.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea188a2b0---rufipofomivanukim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=digimon+world+next+order+ps4+reviewPDF 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_off0000c106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 15408 bytes
SHA-256: 8b0856fa9183e32e606e643cd58b7395f1339d2333a0c6f548c796678aace461
font_02_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 10904 bytes
SHA-256: 953eb971ad917a4987a0f64cfe9d7e02016aa3bdac464196e3d1f1a43cfaeb77