Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d10b7b5edaa91e6…

MALICIOUS

PDF

77.9 KB Created: 2021-10-10 15:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 64de637d69fcbe2380cbd24a4558e2a5 SHA-1: 6789afdb4a6b9ecd56c844c79a24ede22797396f SHA-256: 6d10b7b5edaa91e6e1b73aa9dbcd207e844e620307a366520e74aab0a4596261
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a malicious attachment to a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://lamorenj.com/userfiles/files/digabasogekipiwumanetiwu.pdf In PDF document text
    • http://carsonpokebar.com/uploads/files/40477231940.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/40558652534.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/30004274815.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151f121eefa0---2347952318.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/72738669554.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62876af96---pudijase.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e30c77417e---kilenadijazekuzopo.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/gazinelanusupizipexe.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/sedigutoxivetod.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631714279.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/16387502917.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/wubozituxonositefijax.pdfIn PDF document text
    • https://kuepancong.com/contents/files/76779303682.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/5348115271.pdfIn PDF document text
    • http://proart.by/media/file/17043083418.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/gavejewep.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6cc4301d17589c12c23b3643a6087b4b/32345513904.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/pizudirusakovufojox.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/maxupufowet.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/meriw.pdfIn PDF document text
    • http://getdol.com/page_data/file/lexemixitupa.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/gixaseximemezazibuxuwuk.pdfIn PDF document text
    • https://albertscience.com/ckfinder/userfiles/files/dopanud.pdfIn PDF document text
    • https://citytrafik.nu/images/file/loriburefisadexanatamipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=shore+40a+hardnessPDF 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_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 18824 bytes
SHA-256: 24cbc646ce318c61d56447bad94b834beecd419327915e572988d6836897429c
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 10384 bytes
SHA-256: bdafbf4f0ce33862201009feaad16e45f75486cbf45185a4ea14a821ca8b260d