Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a8fe2dd021ee53…

MALICIOUS

PDF

90.6 KB Created: 2021-08-03 09:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b5f9a947b8ab5d20b34b626ce422628 SHA-1: fdee48cc40893e19fcb4ea80aac3cd82a02a9e1a SHA-256: 86a8fe2dd021ee5382e8f6d71a508af60978be4bdf8ed1474a6ddc9780d0463e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, while the link farm serves as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://capitaldanceacademy.com/userfiles/files/44447041517.pdf In PDF document text
    • http://anquocrealty.com/uploads/image/files/61984219701.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/pewijitulusebow.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f0e620da4---35084178599.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mr7vjkbmm8igf4agp6r4nfesal/fuvobifamemimofiginiwu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094599f9b6cc---94262698775.pdfIn PDF document text
    • http://agrion.org/upload/fichier/dadorapefefamejitavedis.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff48bf86a---mivetedumorefu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r76iou1mmq3hefimps0c3ul7a5/vaxogipesalixutiguk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7257f0fd---pabinugenuje.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/741e3ff5f0e0caf1bfd40e16436af75d/14770453063.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16103d87d512a6---2319785360.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/5813346737.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/84974746606.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/741d9c6219c5fe236dee7d6786930f36/gusilipetixagopa.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/23417447930.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/bnagl1p0jc6s2g31r9ni2v44u7/50019571165.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/586cf6944080d1c8f0c1297721615274/22110469845.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/mubelo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e1df0a488---4274573614.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/96947908876.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609236769ad03---vozotolekuzexusexewom.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/towetew.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11bb08a92---jemamofolodojilevowu.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/3760303564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=el+burlador+de+sevilla+personajes+principales+y+secundariosPDF 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_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10940 bytes
SHA-256: 0bcf5c9fed6b58a46d134f5c40872ba406b34a7de0a4aa8a8f6ec3cc35d2127f
font_01_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 16384 bytes
SHA-256: 7148ddd690250b1f8e8e47991e702f9823ab3ce1fc015d6cfdd4270885e25201
font_02_sfnt_off000143bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1