Malicious PDF — malware analysis report

Static analysis result for SHA-256 c871dcbdadc37da1…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 09:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cfccef55e58560d4ed99b7653cfd221 SHA-1: fa354279e113a8af9697523a99d42beecdcfcc12 SHA-256: c871dcbdadc37da162629681e26abd25df175e954e42c0bdaac55e06755ea188
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=articles+in+english+exercises+pdf PDF link annotation
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/75916756974.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/92027157442.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/80557736855.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/muban.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/27276417914.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/wezavadipevulozok.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11260271731.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/19771300899.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/rokizewafafazoga.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/vubenusarebex.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/botozararefumasijilaseda.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469b5f1683a---zegamodevukerategebosa.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908121025.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dddc6bec---kosukorabixerabi.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/10395391845.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/96531205673.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/wewefegogokogudelakiwoves.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xaxodopurosid.pdfIn PDF document text
    • http://kdekdyjak.cz/data/pimebepa.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/fogago.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353ec57db54---98116812990.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/22872226947.pdfIn PDF document text
    • https://ptogel1.com/contents/files/jekisa.pdfIn PDF document text
    • http://roocenter.ru/upload/file/42747794266.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/sezowosomizonowilet.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_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 10700 bytes
SHA-256: 298d26584e1af93e47a6aac29926de3f7404337194ca885a20bf7f138b73f157
font_01_sfnt_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 17704 bytes
SHA-256: 00f9c75367178c10eb711dd35e5eaf79b48424b3ed6ef841a42ca5e34dca5a91
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.