Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec83ea5f424cd014…

MALICIOUS

PDF

98.9 KB Created: 2021-09-07 03:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55c451d28a023898c024ef722bc9103c SHA-1: 489023d195763d07dd77a25ddf68878f886383f4 SHA-256: ec83ea5f424cd014c92843893b70d96e34dc2e0484d3345ffb6f042c809915ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an effort to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristic firings strongly suggest the document's primary purpose is to facilitate the download of further malicious payloads or to phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://nbmounts.com/userfiles/file/1629859594.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9e68ac214613e5577883c3decc68eeb6/56293164810.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/riwebatogupirilenurozu.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/62598767847.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mvi8fjt8ic509eljd2kun3jvmp/72652141293.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/xoxoxujusi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16123bd9b85e0e---28816090702.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fb53995041d3bddc3b96216af60d8c0c/mulosebo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/06d76cd42a75a00c89fd70b6ed94fb73/70741924285.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/1104632326.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/77002836476.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/31148128953.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/jujarokotudog.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l24d8pjuns442531i5kal10fh6/vibomememo.pdfIn PDF document text
    • http://goref.ru/files/file/vevarakuzeretinasekana.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/11866756184.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6c15c3e5e20a267e494d5d4b0b188870/19215657632.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/fanavezofenejonudoso.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/fudifozu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f98287ebb39a6915e7024394ae840199/73966192796.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xuforujarirolazon.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/pabiruxegez.pdfIn PDF document text
    • https://le27.fr/docs/file/fositogewafigomilutiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=electronica+digital+pdfPDF 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_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 10612 bytes
SHA-256: d9437cc76589386a83c8a5bb32d27148597d3105b91f1f590716d61b177d1bad
font_01_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 18756 bytes
SHA-256: a1f6328cda20b939c61c51763f79f87c58adde60b7031a29a9f4e7cb8e1c9925
font_02_sfnt_off00016639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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