Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06fb79bad993f61…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 21:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 908a5d02168d9f74696632fc31747dc8 SHA-1: a34ad511cc3ae7b99f91f58330786d3a9d26b911 SHA-256: a06fb79bad993f618e3600b6c3b6ffe1b30845fc18b1dd2f4d0c5b4dcd9397c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b74307ac378ad4a9a586bc1c3b9c5a83/tesubabomogujedepome.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nnmjsu9srdp9u4biademcq8pi2/zagivowegigebavi.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/goduj.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b773d2e20b09ec16c15840899e4f4514/demawefuvovofu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073856b9baef---83140133221.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/96e095e3a77902429ed9979d1f1b2e07/3524111127.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c2594a01---xomin.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/98498308228.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210614_205806.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/80660920249.pdfIn PDF document text
    • https://norservis.com/files/files/60655025628.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/rodesataturamilizik.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/97389079188.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tdgvbn119j6luq6f12ao47upg8/5851508530.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bcf51f20fb08881e780a61760c78694/82523084136.pdfIn PDF document text
    • http://4bx.pl/public/file/37599341624.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/majebuno.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/ropejuzikiruju.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1d42b40e---94358657107.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098663862891---13726774795.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/obksbpjceqr1mg9o8avq7k8ea0/mefopevozewepedabi.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/6dec3fc9084bcb497c46bb86f26888a0/56902872069.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/g6jshs1e7vi4md1tk3jimjc0lp/80453134190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=death+in+the+tall+grassPDF 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_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 17140 bytes
SHA-256: 8c8cdaba9d4554fb83becf43b6e761b3a57c693c60eca566a65113a6b5e5c3fe
font_01_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 10268 bytes
SHA-256: 719b6b63b417f25bfe744d2e17422de1c60c90557d852a9d66aa46a164d59c93

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