Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55a563475c9ecd7…

MALICIOUS

PDF

90.1 KB Created: 2021-07-27 15:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1552f5a9d074238ae95c67e826d7eab SHA-1: fa9b84ed58257f6e4782fe3c85c1f43938e8db0d SHA-256: e55a563475c9ecd77fddba1c3f92ade96d94ebf991f64a88eda8967e47ec4391
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of a visual download button lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tg8jm1kc52rn136nffkf99sjm4/46018093182.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/59129107244.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/30021959266.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/21321821733.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mogamezalu.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/77190768258.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/92205520552.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0ec9059ab03ac1a13574c4342af32329/34758389727.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/rexusebemotafepuniv.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/vakojusupex.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/266eb4751a2403232136bf599129c88f/dewumetorikexaki.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/jutijizosojezeneti.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf13428dfc---59622622885.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/786f059e976f104d13d54d32450d0605/17461290387.pdfIn PDF document text
    • http://jarosi.hu/files/file/kerakopuxivinolakefiworif.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/62000442273.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/pilavibemafi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cc6h8ftvfg6fl8mq4ka6cmn687/riwefifukutefegifepixup.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/77627420466.pdfIn PDF document text
    • https://shibbirs.com/media/files/43407396055.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3f663a14cfa1c37e8c789ff460d0c814/58418701252.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c656c10f---gusavowonadiduwi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a113dae04e8aa47dadcf5270eb754020/10800664432.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77e4077272---30206223977.pdfIn PDF document text
    • http://maryamghiasi.com/images/upload/files/ramojaruximelun.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/demese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc2d2fda0---94679608191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=subway+surfers+game+for+pc+free+download+full+version+for+windows+10PDF 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_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 11620 bytes
SHA-256: ac0bf815f1dedd586d30747c2814b0f34fcd2e542a5a7d42ed9662c6812807e0
font_01_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 17360 bytes
SHA-256: d8bc5b998de968fafa544928ac901e705b1662b024087c4003a38522008b7c57