Malicious PDF — malware analysis report

Static analysis result for SHA-256 276cda1a08c6b6cc…

MALICIOUS

PDF

100.3 KB Created: 2021-07-01 16:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cd01ad5f9794c484073bc57a74624a54 SHA-1: 30f50fdbd9fed7c2e3ca0a87b90d77ef1e0e7a60 SHA-256: 276cda1a08c6b6ccadbc0261404151c6b5f223ea1b54ca6b2c486c0182136e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised or disposable domains, suggesting it's used to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://seabeachthailand.com/UserFiles/file/dugatimogel.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1f17c70b7c57d09542cd164e5b3eff9f/nunisof.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/38720792222.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608601bf79349---wigoziguxoburajaxezixeda.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355edee0b9---zupos.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775fc91ca22---dimuxife.pdfIn PDF document text
    • http://leton.pl/userfiles/file/46703032087.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/53716152801.pdfIn PDF document text
    • http://blueyee.com/upload/file/180751596077.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd2c774d8---vizitabatafut.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f030cf87---pibisesofaf.pdfIn PDF document text
    • http://mamam.by/upload/File/file/68655157574.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/suviwupaxatuzukoga.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2orkkbjqmvmvv940d566pv83lt/nuvewavavojewobenoxopigi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607182e82bad3---12530228796.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/07b2d041521b9a55ca5ca3b7bcaeddbf/nuroniwufamajiborogeja.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609049a5f2528---garuruzurofe.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/jdpog2ktigjghfjv0mtj5het8h/57830396365.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bc5b985f1e8758c48bb846d29d0e783e/mogadorabigekebo.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/lizolo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608f01f0a0cd2---24013834321.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/21652273699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=french+alphabets+and+their+pronunciation+pdfPDF 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_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 10932 bytes
SHA-256: e8db5bc6823f4f50573732b26c92dddd393ef660bc096c1c35c46d22df820303
font_01_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 25160 bytes
SHA-256: 3525a6f0e7f3e3224e68b227dcfcf01c7db46c0f95f1203d0831b4220566c26e
font_02_sfnt_off00016b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1