Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be2f2da03c2539a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 18:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 871588565d6bd5907664375850241aa5 SHA-1: f6376b7cd111b3ad8a0f83202bf1ee58b75035b8 SHA-256: 9be2f2da03c2539abe24e49da1a21c22a4f9a2a4bd81532ea46eaf64949c3d75
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous links points towards a phishing or malware distribution scheme. No scripts were extracted, but the structure suggests a lure for users to click on provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138281ed65b8---28867620210.pdf In PDF document text
    • http://jurabos.nl/include/editor/file/xagusijifijuvezaso.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kotifivonowag.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147991bc2d8d---guravomasapenapisewe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd400efc7---11131404945.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/tawisapisibogulus.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/dujizijiriw.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/tanelexap.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/42980315444.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/97599661804.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/dotenilakedi.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/zakexomasete.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/kexexen.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5614_20210918023532.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/lutokovekira.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/nepedipuketevojapi.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/89318034092.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/kevanekunokoj.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/suxowaka.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/7200502251.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/bimulix.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/43144854980.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/27505201974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+3+year+anniversary+apkPDF 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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 17476 bytes
SHA-256: af7feafe7a29e9c3fdfdcade287aa3bff311d46957dbc2a2e0db80d568c6649f
font_01_sfnt_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 10560 bytes
SHA-256: e061893bf812dd5a5e25bcc1105e38b86e683e8a78037fa7651f02a8dea7af3c