Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3db99d0f7e1574…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 03:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d97de782434ed736fda8ac79f549613a SHA-1: 41c3474a4504952352649ca82396678e4a4cfa62 SHA-256: df3db99d0f7e157484bc3b68173dbbd51e827edf7ab2d53700ac1e5481635880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous embedded URLs indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915887a91ce---jevividusewubexavujinovu.pdf In PDF document text
    • http://graficaeformazione.it/userfiles/file/meluwasupet.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/93946203131.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j5697grk6cp2agmt3abkuu4phs/xazovizixalu.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/kiluvokobupamow.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210708_8DF1CAA7032717B7.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/luvosoninebonawuvelu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9f45ece029dfa39ca8d867d84b0c6aae/notolixuloxuladil.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///81788093671.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608542d9b5292---98524289796.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lenanubadowisiv.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/55428400970.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/22804289812.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/27452244103.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a95403f5---3682185835.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e4d0dd0afc6a15cc1a3575da61c6d86f/lapejimudukaba.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/21471287172.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/t5nqh8b2eo9q72o0o0far3lj0u/dedodorugufegojuxuvukika.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/66855598477.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3b4511ea---ninarimiguwupal.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/apkpu0m3911bjvmquaaim9ar7h/mipejegimesojijuroz.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/65771107909.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gokuworagamal.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/5494731395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=esic+udc+notification+2019+pdf+gujaratPDF 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_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 11292 bytes
SHA-256: 2e6fe2f9a3238c6fca9eba94a3f825be388c8664431f43435d1c99d5804fb76d
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 17704 bytes
SHA-256: 5d5abf84aa93dfcb225285827dea1aab7bcb69b26677655a993e6a73a96a620e
font_02_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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