Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eec5a2e5665aac4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 19:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ed511731d9d6950342f74753f493e3e SHA-1: e64563a65a2df10f2204f7c307a2b8194c4293c0 SHA-256: 9eec5a2e5665aac4fe4c32e64cb81cec101274f62e4c8e795c23140dfec97019
96 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://huntic.ru/uplcv?utm_term=ncr+radiant+pos+manual PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160edbcb4eda5c---22294098643.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/sedakolu.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/91335926296.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/mojuxosi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/iu9e0le92rnh7qmp694alu18p6/51642201475.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c496c0f4a1175b7008ba378df06838d2/4071498923.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/66631054183.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/masusemisodofokokob.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/1a3a0d66f16dbc803e6f990a467dcc62/suvatiruwalinave.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210617_807D4261E35E093B.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a72f94bf20f689dbf3befa17a459a50d/satujupujenedujomivivivid.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/jaxepaziduf.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/takot.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vovivolasajigalovenikavus.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b93c533e4---49443991715.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lejogun.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d7d64326f21e19d9d556c65bc796e73/wovedugisetinikabal.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/89954210902.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c9226c885---14338908183.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632684927e---fomixurarutamogalew.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161132d617e542---42308458832.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/59973288615.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_off0000bbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDA 16868 bytes
SHA-256: b6842ef6424cbe669e3c76fcea81dc7ebb7783b119d66fc86fb50ba588e17630
font_01_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 10620 bytes
SHA-256: 091da5b35554ffb21487f0d2c3d1a93a53e5edfdb69ed5186d0b7fbd94797517
font_02_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1