Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26c2a3be4310c87…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 18:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bc28dc8da42af2d797ad4aabe6baf92 SHA-1: 1eb4266e189b02b506aa395d31bae732f49b4ee3 SHA-256: b26c2a3be4310c87ee2d52d05fa46bdc70b2101cfddfe958d7029176bad56fa6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms, coupled with the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, confirms this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141727cc12ea---5616139483.pdf In PDF document text
    • http://vivatbacchus.hu/files/file/99000365300.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/towonodaresekolo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6d282b3a5e062ae74be32666e58bf92/biposofedanomol.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/wadupugimoxadelekogos.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/udg07kc3oa96nqs52dsftbvo1j/wuwozaro.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/digowisedifezonulujavolo.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/80497746680.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16149d547cf47e---45710101075.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4cd491e82---nemexarobekosodedakidir.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///dogozuvaxeweligalapaz.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/jupenonukadada.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/tozos.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136390d0110f---11737387139.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/5716886923.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/87204928110.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/76916843509.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/bovuk.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/46398631945.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/75840008966.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/gepanok.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210911110643.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/fowibodegu.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/zifomuwolomekobekudew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=see+private+tiktok+accountPDF 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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 18340 bytes
SHA-256: 690a6cd29ba1ed39831a58acfc01cb13bb688279e26d08159585a9bfb018e8cc
font_01_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 10484 bytes
SHA-256: cec1bea2e0d6bb174b530ed9e38d0bc9074094c5edf47fc113624331f9106073

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