Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc91df29dd4686be…

MALICIOUS

PDF

89.5 KB Created: 2021-09-16 21:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6879db05aa132907999c811fc4d30b9e SHA-1: 1269ef84da498ae78108d74695b0b386ea4b40e4 SHA-256: fc91df29dd4686be928c608b64ee694d548857d5fe17d776359aa6ec7fa9ed2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vinniescustoms.com/userfiles/files/43133245119.pdf In PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/48397076993.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fewunuraxateraw.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/jabovuwefome.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16138fae372884---zozukupo.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/tuwubepirabasi.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/23877015504.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/13337983467.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/makupepedozuxagojuxunufu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613879ce30a3a---59440657138.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/73622953644.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/lusipigifakawigib.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e584689c77---61582201612.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/fubibowilowide.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/vikiv.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a7d7d29770e04e2193baeb1a30654403/zepiwedopojojabesozuvo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/89vcmlo2up94sa44n6cem2lriu/vuxarizof.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/nuverazojovutumelemiso.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/beredifulig.pdfIn PDF document text
    • https://adikketiga.com/contents/files/44240774412.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/50937070483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+can+i+build+in+minecraftPDF 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_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 10684 bytes
SHA-256: 33710812d20e0c12c5c0b1ce71b8a0eec1d20c556412362494c1c240ea092c83
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 17712 bytes
SHA-256: f85509bef462a91688fcebfde654263862882b44cc23419f47d9c89303669539
font_02_sfnt_off000140e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1