Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf23d0925ad3ef4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 19:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1511cbee4462e4cc1ed5af723147902b SHA-1: e8bef9d16c3cc6ae257ca1d10982ec13cc1fb1d9 SHA-256: 1cf23d0925ad3ef4dbdd3129875432fce776e38a19a1ced58e31be900295f3aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution point for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lammensfilip.be/uploads/files/14065802371.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074350474b33---pojifezudajopukekaxi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091194b2fff0---kipufegalozopidofado.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/73503577995.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/zofatikepazavebojibike.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/35a1e6c219dba427c9e1d9537716f10b/85413431131.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/21914161199.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff0b5dd5a7808bad534f46638393088b/sukotadozomafava.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/sijurujazinupise.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce682d7f8---nudijezumoko.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/53573599158.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/cc412a95568d8fdf7f59a9f63e16c5a0/37771816441.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d51b02bf8---1632774541.pdfIn PDF document text
    • https://palet-school.com/files/files/69029509503.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c966e9dc---kakarez.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/vufisalapina.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jisuzetigafotijibok.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ead199064ed1480d725d978883f9202a/99079870641.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021510175575407.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/81826555282.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/80717820376.pdfIn PDF document text
    • https://ka-base.no/images_content/file/pavabavorak.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/11563495125.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/detudel.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/pawunili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tarrant+county+clerk+deed+recordsPDF 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_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 10540 bytes
SHA-256: ab21a37976a451e199749b3035847b5d97f6b96b7ba2e258e03fcd917e1ae728
font_02_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 18412 bytes
SHA-256: 3a290675743e093e802bda1e44d2ab055c4789f9637e12a8cb145fc9257089f1

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