Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbacecbf8cb24621…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 04:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39be8fcb92a24b2ced0acaa305c32c64 SHA-1: d11ce4f0a4eb941c1fca5f742851cf7fe5fc1694 SHA-256: bbacecbf8cb24621dd678ea3c583740937870542219046eb2f3bc9e738f88fb6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest these links are intended to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://manilag.com/FileData/ckfinder/files/20210819_86B6A6D6574D8CBE.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ektopfcrms80kh47fcmoar6n1k/pudezuj.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/31791639070.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed57294d1---kovikore.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/60715932575.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/52cf0fa3903bbdc1353a453a4b79f782/vodiworuwabi.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/44167581150.pdfIn PDF document text
    • http://ndt-ultratech.com/files/27548572284.pdfIn PDF document text
    • http://topp.pl/_topp/file/22771654123.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/95945925738.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/21728187805.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/tufir.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/wipewakup.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc268db886---xijexixil.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/58708875193.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed0f1a449---gonawivimukikifanuzavi.pdfIn PDF document text
    • https://csn-alliance.com/data/files/22136881965.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/83718139fddf8d02a3f4eaa173d818ad/nitotobowakubepepeduzavug.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b15dc626---27032708551.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pmekant4sc4ub1ejn0o1o4hsl4/mifibewizo.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/99785491341.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a040e949183---bokularosuzikaman.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/nebefedixagatu.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/dasiro.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a7460a298---besekufek.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b26165f73---jekusis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=osha+electrical+safety+standards+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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 10736 bytes
SHA-256: 7e4e8ca94ab49e332be640fd1cf7d2c7af8edf4f3db715aa75ef4f32b692be9b
font_01_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 16352 bytes
SHA-256: 1e0852e4837d59cc64edb09bff894d68539bd541fea80f2ab6f8668f7fe48eaa
font_02_sfnt_off000124a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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