Malicious PDF — malware analysis report

Static analysis result for SHA-256 517d04e79395d531…

MALICIOUS

PDF

83.1 KB Created: 2021-07-23 22:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d3855bf103eadf6b46635822e535bfcf SHA-1: ad6a17ed6c0c95323dfbcacb61c6f7147aafd277 SHA-256: 517d04e79395d53118691ca89c5d776cb9210c9f90fff2a96f8f677965a84810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The PDF structure and embedded links suggest an attempt to lure users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://thebeautyofdesign.nl/ckfinder/userfiles/files/49511313165.pdf In PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/23654062710.pdfIn PDF document text
    • https://giustofiori.it/file/32669743342.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/bb6d674e412e85649d2c7db07af50ac3/91472621114.pdfIn PDF document text
    • http://atiksigorta.com/files/gafetazogimo.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/sogugujatafufe.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/jonajugisopad.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/49597847894.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/cc3b8859c6786f67fc12c2c452979b01/91059115361.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836554f0376---kogipumedogunidu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071fcfd80891---bevamigawitefanovukub.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5efaf7ef39---44383702406.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a593e3825---pezajawowano.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6c5ece87b0aeeb87b5e27bc47204942a/70343996819.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/29648908101.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/98284973090.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5qvgbdvgao1lig9pr5cfi7td3j/rutavosafeb.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/42882236795.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609038e0ce5d3---14679456297.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/vezodudebamirodopenaba.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b344dc99764---bifininewiforapomevewu.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ab7j76nctniks329j03ub225h0/71951165165.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61f6d9d70b---80163904520.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/sg5g9psir9sa693mbbkps46k95/tudosisoxibudiwerimotexuv.pdfIn PDF document text
    • https://myhoteltrip.com/userfiles/file/gewasuvijufivozaguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=esen+yay%C4%B1nlar%C4%B1+9.+s%C4%B1n%C4%B1f+matematik+soru+bankas%C4%B1+cevaplar%C4%B1PDF 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_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 18420 bytes
SHA-256: 05df6cef90c75383b0b51b49f20586192df194105f69e8632bf84e79f58178b2
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 11416 bytes
SHA-256: 8348732608c7922dd6ca8100bcdfa677730f3fa7fbef1230e2db67fd1e618ba1