Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dcf6b33c8dab52…

MALICIOUS

PDF

88.9 KB Created: 2021-07-17 00:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3d86d288200ce35162e3b7ea42379dc0 SHA-1: a2cc16f401c0f7431e85f4b5e26bbc50210913ca SHA-256: 25dcf6b33c8dab529ef76519d9d94405a6cade99d24e0f929aea27404b0e435a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or to host malicious files. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yishiweb.com/upfiles/files/20210705_050220.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b0883ed13d8---62021424636.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/lenetorefikonaligewuzevit.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/10132491774.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jipixapapivunaw.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9051aa2a32883b6117de7b206bc9a3a4/javadusoguvo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6de43c4c---tonuriro.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/733vc8oqtffakvmbouseuoea55/golezo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/85a03e629e55e38df8aba77b2061dcaa/koliwinukab.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/3182335891.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/12400160646.pdfIn PDF document text
    • http://chromavials.com/d/files/wuwilimepu.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/28607456851.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/9sgcaqu4mm3gnde4posbkeb4b6/xekapoku.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6b1e49561da811a036b11419cb4d87f2/pasipobizigakotapabuzugi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6845c65d65---girafotuko.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1eon447rjt43ovkehehvt9f4p9/moziso.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b89b11ad0---81946930892.pdfIn PDF document text
    • https://ckmandarin.com/uploads/73764836403.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/16652822527.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9e1e9448---nujesamexosovazu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/14943812822.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/redupataxenurewabenid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bliss+1997+full+movie+free+downloadPDF 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_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 16988 bytes
SHA-256: 67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b
font_02_sfnt_off00013c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C69 10992 bytes
SHA-256: e0524348fd7582630c51e4c55f3a958f781dd65668b46ffd516b01a7912f4b01

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