Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1b8f27ae699cfd…

MALICIOUS

PDF

90.6 KB Created: 2021-06-17 10:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dad5b89e11f2b99ce4846d55d62bd35d SHA-1: 81d307db28fe64c6fb2fbdf4264414273728762f SHA-256: ce1b8f27ae699cfd727de4badadd16ac9fcafc168a7601077a1532c7bf9dcd9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be a lure related to 'Maplestory m mesos farming'. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/uplcv?utm_term=maplestory+m+mesos+farming
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986dc363dd0---vusejopifumid.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d61032a1f---kibemulusebemedepik.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0f46a6c21767cb38db03c6eccba36b5f/60624251136.pdf
    • http://www.ferm-matic.fr/upload/file/9826513007.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/85720313745.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b51686930fe---fobik.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b7f8d96bb7224ce0ca2336025cb5539f/54494107213.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5e703c97---lenuxasegafezovasowuxot.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/46b9faa60be86447c630e98aa7ee1173/pasoxuparexomoni.pdf
    • http://feach.ie/images/uploads/file/6473416046.pdf
    • https://peterdegendt.be/file/pamizebafapewalegufit.pdf
    • https://autotrans911.com/thread/admin/uploads/file/gawonepuregoxasemaxe.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5e0c33a1---risuropifibe.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9246a548bf664151ff43f20da29f53e4/34455943200.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d433250c7---tijafaxusu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116bf.bin
1f5f6450b4e11d265b4b20f0fc14bf533fbbfdd16a9080a610ea56ff1142ac99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 5116 bytes
font_01_sfnt_off0001281b.bin
da9e81908f7dcf541d18d25d40b8fe63cb909196a9f2eb6a3a09fcb1ed6e9e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 11548 bytes
font_02_sfnt_off00014f75.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F75 4324 bytes

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