Malicious PDF — malware analysis report

Static analysis result for SHA-256 d581485ff3a7b136…

MALICIOUS

PDF

128.0 KB Created: 2021-06-19 12:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c3ca0ad19f6bb9c62f2cd25669cb4df2 SHA-1: 1d1cbb4c10391779f50209f386bf4e31f85bfbb9 SHA-256: d581485ff3a7b13656f233b4da0af91a731b664697f49dd8869a72e625fd69f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e53f7f4a8---vefuvuritujolo.pdf In PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b3f060dbd37cae887f812f8772f7f459/36143366036.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hjf1se55hn9e0i6n2nv6ko74mm/lolavoduxoxa.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/12788005903.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872613ea254---34411662298.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9856e27d4f---47645664854.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/25429510430.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/69547333396.pdfIn PDF document text
    • http://falerisztika.hu/tmp/30384006890.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845d321d46---lixopizodiwewavovaw.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b38de9b3c---50119540416.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/g1fpavq66un2i98heeamcndi93/kumonixapu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/723f7eb9f394c4cb4d8f6e62544d4ae5/gujaxito.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/56879461610.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/55321419700.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/28646960237.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075805d99071---wudenizukeximukowerak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+skins+in+osuPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 55040 bytes
SHA-256: 76f5aa3eec395a4df632ab7cddd949077aaf4bd1aa8f802a80c28cb42579235a
font_01_sfnt_off0001a495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A495 4840 bytes
SHA-256: fd715461f9405b9a0f5f466479b9b01f334c19f00108e3dd85f7ba80103db2dc
font_02_sfnt_off0001b52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52B 11700 bytes
SHA-256: afed4bdf4bfaf71ccfdff79f054c863c9dab2264f28e7c5d6e5a1c5c3e86bf6f
font_03_sfnt_off0001dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCF5 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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