Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa084f1a4401ec2e…

MALICIOUS

PDF

120.4 KB Created: 2021-06-27 05:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 702f508db3a7c877858c1d887d6100d3 SHA-1: 480a64bab6e4fa8a05d9bc4c5f1ffcbbf7169a55 SHA-256: aa084f1a4401ec2e7c8d0c7aea0a3cd9da00426a59077b673864a02bb603ea52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba367b791---somupuvumararidiparuzu.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b96e878e---1459584684.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7fgan5gm65lt0j2sl67aih0k7b/75397385976.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6176f2ed23b42014f7b4bee1ce118974/4275135579.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b53e51fce---57579079206.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/mupajin.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d72944fb---78764672035.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zuvobupumuroji.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3iopg5vf8oulbkggq0fhji653v/sezenidukovezawekemo.pdfIn PDF document text
    • http://accronline.com/userfiles/file/kujarolovefa.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b063e770---rawenatesafuxagasudujo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mipujivetesorolozeno.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a6ba1231f3b76712d5d3cfa33dee9c69/62721305085.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/004e0cc87aac8c382cacd0605e63115e/38176451634.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab395cc6b---dikesasanemejejabo.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/15534879059.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c780a70ed31---kowufi.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/nogipum.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5963dcd30---59505309678.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/15287561062.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/70873236065.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbf97f9c7---94112931538.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/c4d2gm2plj41nak91qhlo5lbd1/90670319812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=person+in+environment+theory+in+social+workPDF 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_off0001761e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1761E 17248 bytes
SHA-256: bca71144ab1a9bb3618ad4649ca40490924d496cf656732a76941fb39ff7625a
font_01_sfnt_off0001a33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A33B 10852 bytes
SHA-256: 4a072c8b7ebbf3d0a5dd2314d1d82779dc8b55f104dc90af34140a7f0963da12
font_02_sfnt_off0001bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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