Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9ea7d2d6bc9eaa…

MALICIOUS

PDF

75.6 KB Created: 2021-06-28 01:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d795ee29cbcf4cf86f2fd841174312bc SHA-1: b09702b55776ae5771a7a0c469824ef9c1b47d2d SHA-256: ea9ea7d2d6bc9eaaa87b71823dd3d937f1f90c58c71c2b68c1a435513201d1a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=resize+photo+to+50kb PDF link annotation
    • http://seamacros.com/upload/file/96877331511.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/21766948952.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d6a323c103139cfb0bb10bcc53258727/limaseruwike.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7c5db099eaabe2a3ea1259749da4c796/zarajugumegasutafabuwosiw.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/39761159590.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083df746c6e3---52514839430.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/rowedu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c779481f5b7---90508480905.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/81420073968.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607172f7c4cc6---gimazenenafozijebuj.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ecc963ce---lazipagegagixinu.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/6467626696.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/35131534139.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/17180255942.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607988505d991---newurigi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5964e669---88289095310.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ed8cfb090b331d51f351f120d689b9b2/xadofumabefo.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/49708558119.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/a4a1ean9gi3lc28uturvbs1nj5/belufalowifa.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/29845358487.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/mapozapun.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/jamesopafixixedeniki.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/414d9ecaf56fa0796041be1b783c9a50/kugen.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819eb4752e3---96272792024.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/74931140162.pdfIn PDF document text
    • https://aashianarealty.com/file/14494696304.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_off0000c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC655 10528 bytes
SHA-256: bb72d419287a1fe5abbedd4aad9b0d02bb012b8cc2615b448e8d621ca07d7bae
font_01_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 16452 bytes
SHA-256: ffb7c16a064c16c45aa37b6279377198da96052f5476da4403e8673342607a7b