Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3c165917dba082…

MALICIOUS

PDF

92.5 KB Created: 2021-09-20 17:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 94ead53f54d0a5cb531a61f84ca3a18c SHA-1: cb9e24b04aa17cb6a14817b616f002668fb3431b SHA-256: 1b3c165917dba082189e6c4f1cc53cb144b54c1c79a3d64ea3a883c88acd717b
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140c05004209---ranuguzadaxoli.pdf In PDF document text
    • https://senegal4d.com/contents/files/simeb.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/zopasalebudodopos.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-2/20210902175538996796.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614530fe8feac---13493063704.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/kuvefovi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/malovolubojilatekakex.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/neraxomodikex.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/341b2ec047689c4b3fbae98ba7e093c1/lajejalurule.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/fuginu.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/sewovutejo.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/galaxuwipidirijovefurod.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/78901675182.pdfIn PDF document text
    • https://negaratoto.com/contents/files/gopezidejogofasana.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/79554289874.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/91315630725.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/povilegezeni.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109130356323684.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/63212bebfe0c7bfda314b24962fcc9c0/xuzek.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4c152ad2---53038277217.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/91330094376.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/loluxunofot.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/77176471964.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/bezofarewaxedov.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/3045869794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ultimate+fox+simulator+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 10812 bytes
SHA-256: 095d1173f5adfdef777aea1ed311305492cd9ed5ace66ced7e577cc7c18805f8
font_01_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 17780 bytes
SHA-256: a9366cfe2097ff0389df4e73ad192285a24295147dcad3722168ca0591b7503d
font_03_sfnt_off0001363d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363D 17432 bytes
SHA-256: 4f9f2295484202a1adc5ce7fbce1bfda7e3d5feb0f666f1f16396108be03b378

Open this report in the interactive analyzer, or submit your own file for analysis.