Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59164bf4b17acb6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 12:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c127ee1e8203196befbf32ab6e548da7 SHA-1: a07b390dd05c8374e1b0a42f07fd6b3ea4d697a8 SHA-256: e59164bf4b17acb658df139e026cab57590a228335fc016208011ef99bb70683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://philabc.ru/uplcv?utm_term=dc+adventures+universe+pdf+download PDF link annotation
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd8d84a5f2---40002245354.pdfIn PDF document text
    • https://seikai.jp/free_images/files/83111153546.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/13795980534.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bizivasozovif.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af34fc7c1a2---90562743235.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/zurawozono.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04d7c2561---74997308532.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/jepajulax.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/96072825617.pdfIn PDF document text
    • http://kasargod.net/uploads/file/49305159688.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f9aquucahe7o8bol7rmn9pcirt/69185939889.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/73594287971.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/nagexagiduxugirugasap.pdfIn PDF document text
    • https://susta.vn/userfiles/file/rewowowefe.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/3016845956.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/32219183696.pdfIn PDF document text
    • https://parfumzone.ro/files/file/xofod.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/99995159889.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949d4cc47fb---92488264389.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/kikafenuvigofosefatafize.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d0f0f619---tilotirovetutarux.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/kakaxedajekilutedujedade.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/23613735979.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/60948946583.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba111c8f6c77115803be24ecea894a41/pomesuxakijoxi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611877ce563e4---belifobel.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/256294c41272e01ccad0517d6da8d102/9902650343.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 17984 bytes
SHA-256: 4ba5624128dafcbbe61ba51a871e18543cf3da30e3fc084c77629478c9feae92
font_01_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10864 bytes
SHA-256: 9fd358a01fd7d8aa7f3baf77beecfecc4a90b07e02c32ad283eba5a18a01649c
font_02_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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