Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b3519ec40f06bf…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 22:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8de7002c4cc33b0af5af2c2a46583cfa SHA-1: 1fe8f004469a27cb0ec5fd369937887cec3e3b6f SHA-256: 22b3519ec40f06bf47881b2a3d4b27a20f9cde10bcfda4cb7639771bea8e4a8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://oniceh.ru/uplcv?utm_term=pokemon+go+mod+joystick PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b799b5a3e3bcd886538dd9f2553a959f/kelodupiluxizilifezimapu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2f9c9a57---bozudaferujixa.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/bexifalebuvaxixen.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/17426378488.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/79345330252.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612effefe31a0---mewagelulatipetube.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0ac3fb84---metiwusifofutabasimamodof.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/38717323663.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/lilutopavevezibelesuxetiz.pdfIn PDF document text
    • http://twilaw.com/files/files/94002811032.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905093739385420.pdfIn PDF document text
    • https://shidoremicrosys.com/media/17438112289.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1c85f53a456c032de889df28740c6424/sebefikawu.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/50115162340.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/39044488578.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sdqft1kahd2cd0m9q113frru6k/wilazenuzodabosogi.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210906152221.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/79522999352.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/23622221697.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109061646096866.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/remisufozes.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/topubewalabisapowur.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210903_4FA5DD87ED2AD002.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613507bade9cb---80956718891.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/18194705267.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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 19492 bytes
SHA-256: 452235f05dde2eb19dd5072fb76028ac16caeaf0ebeddb92728273eeb073a7da
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 10744 bytes
SHA-256: ea1ca6f9f2a5d9320ea2fe5f132ec485b5dd63b2e6f3bfe58b932241573bc3d0