Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8991e3ec6aedee…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 02:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ee5b80b9e66a797f96df9f6f50df2f7 SHA-1: 74cf68b7bb9f910336c4c2096c411e70578150da SHA-256: bf8991e3ec6aedeea9c21928c8b9225e270a9f49fe68ad07bda2671a29f82396
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 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 https://huntic.ru/uplcv?utm_term=dynamons+pikachu+mod+apk PDF link annotation
    • http://slovbau.sk/test/userfiles/file/24649984308.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132781e3809c---bivunisedimuz.pdfIn PDF document text
    • https://artbynela.com/uploads/file/nowiledizixam.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/tizotepalokivirafebimozal.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/27717158280.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/25617556845.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/xoferi.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/tekelevazajijeda.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/dufenexoxelawenonusi.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/vadipafuvoxujasifavadu.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/48309188336.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109251000238745.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/vefifovupakazikomizegara.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/vebepavetoxudubop.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147934ce3c23---18007030690.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/napufosonesemenapujo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/238f36cb70350e2dddf041962884189b/12316852506.pdfIn PDF document text
    • http://santehnika34.ru/images/file/wodosomedumovaropaxa.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/65948531790.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/rixewisamozowawutimun.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jukasetinojerotojeligodok.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/61e9766dc85389d83df8cecb3dfeabc6/94301021049.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/jurifisarixuvijofomes.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1a9e23a2779a774db0e064caa428154b/doxarevexovajananof.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/62278716975.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wusekivujefasi.pdfIn PDF document text
    • 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_off0000b5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 16072 bytes
SHA-256: a0d6e8aeec6fe8d1b31a7958315c00979e333fcb162a1a59bf48722fedb41c96
font_01_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 10712 bytes
SHA-256: b480eaa1f2b4cc0ec31c82d5437ec4b716e20268ddedb2aabf27565d719226b2
font_02_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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