Malicious PDF — malware analysis report

Static analysis result for SHA-256 8286c1696f3293a0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 19:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71ec071e08b0224e044f39873d6c8522 SHA-1: 6d328a681f81d226add292ab899439a56c8d4abc SHA-256: 8286c1696f3293a00483a109bda3fe4088debb4cd171fb17ab4fac667551085b
144 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by numerous heuristics flagging the PDF as a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of a visual download button lure further suggests a deceptive workflow. No scripts were extracted, but the document's structure and linked URLs indicate an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://ketchas.ru/uplcv?utm_term=gen2+tv+on+firestick PDF link annotation
    • https://villadorottya.hu/uploads/frontend/files/99317983746.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161340cc424aac---25580754255.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/2321338014.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/roveribasa.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/39338961008.pdfIn macro / runtime command snippet
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/23e52a478432a0f8d33cefa79e01016d/dipogexeji.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/36705045896.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161329d7b9a1c7---penaponof.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/33953431201.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/nekudedinaf.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/27327490431.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/21869764161.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_9CC28E2421550E30.pdfIn PDF document text
    • https://ferropula.hr/files/geweputelipadaga.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/17320525351.pdfIn PDF document text
    • https://andrejc.si/files/file/didezof.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/ditegagejolimimexifilivaz.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/28575069397.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k8d8n7jjv7eimf1gc5btq0055a/27193372707.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/77286484923.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/zesoretexegufelinotu.pdfIn PDF document text
    • https://kawanmto.info/contents/files/kusapi.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/88383269104.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/61320026845.pdfIn PDF document text
    • http://ecole.ru/text/images/file/83298733378.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/58150982267.pdfIn PDF document text
    • http://phuocthuan.vn/imaIn macro / runtime command snippet
    • 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_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 17848 bytes
SHA-256: 2ed71d22c6cd5796bcbeb58ac79397c38627e1e62f6e12b8a338ff0d707b9016
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 10436 bytes
SHA-256: c3be236ef6f9dcc7732305b1c29856c0d3ee23972b6322766011444e623b35ee
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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