Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f63e61c0dd94499…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 01:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b86b9601bc5e0ffc1b9ee69ecd3c2629 SHA-1: 71b49ffbed32a24f95787f91dd5e348020a38e43 SHA-256: 0f63e61c0dd94499f8c80fdcfd613ac2b0bf889479d157b5b0863f49344767ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with many URLs pointing to external sites, including some hosted on compromised WordPress installations. The presence of numerous PDF links and the use of disposable hosting suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://emenu.hu/editor_up/14688996039.pdf In PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/mivewarogujakefeza.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/39981249123.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/bumitokak.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/wixazumoxemezaxajupas.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a6ee665f---nokegaginodefujumoti.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gekaxoxuli.pdfIn PDF document text
    • http://headrepublic.pl/images/files/54788233247.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/woniledosudaxafodev.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/mifemusagozimexadef.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/geribeworefubokadu.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/nejofiv.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/dusukazavugafe.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ae62bf8a91c62618c56a2ef2d219913e/jujezagovirorofukezilaz.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/mubejazatum.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9914a7b1311e4edf7ada8ab99db8273b/92980239416.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/gibenizivozulovipegutuwum.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a796c42d3a---dezosarijog.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/47dflnvjtlso842bgu58fvjpr2/80392100324.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7067622cb---60041862817.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210810075047.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/20005701835.pdfIn PDF document text
    • http://dges.in/userfiles/file/jenenidunax.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gd999ogjtqsa87grb731t8b6ht/28553705085.pdfIn PDF document text
    • https://ridersshop.it/file/55966763898.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/h8fvjr2u517bphd600oj19vqq9/63100753665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=verb+forms+list+pdf+with+marathi+meaningPDF 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_off0000b7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B8 16264 bytes
SHA-256: e301e2ba403fa198f0b27bf92fac35941ca16b41d4ded55897b9324413e359ec
font_01_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 11140 bytes
SHA-256: 04916805264fd5a6f168ea2b0059222fb58948648c1c5edc655268266ff6d045

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