Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5d0eb7d839d10a…

MALICIOUS

PDF

109.3 KB Created: 2021-08-18 16:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 994503ea59cea3b71e706eaf3d5c35dd SHA-1: 7c02e577eb74a047a535be6bb1749701036d427c SHA-256: df5d0eb7d839d10a61cdff3a55a3d72452b6d94d77f89b038e5503386560c806
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://egca.fr/userfiles/file/wavoroxikudawumov.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/a8a2f510f8b8d516d64214aceec019ca/kanorovu.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/jubipusirujesi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5a9877fba271ad469f38dba9c863116/30548425124.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36c826b4b---sigexerugorop.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/df86fcaaa3ffdc457fa4c5897102387c/6972913676.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c6023f09---45310962565.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/87454153879.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eca44d882---penugivimidotexofotil.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fupodovinepetozibagudafew.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e359e31e22---kufizawitidadikavamuriwil.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/dbqi0sukujg75gsgvstuqkpnd9/52220464843.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/fkehsfptl0j1m934afbkl351pj/70556647263.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/97137933098.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/19315431893.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/nofekoz.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac16547688---93942103383.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d221ee53c9---sefibakubuxowokijirobaro.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611669eb13fdc---65425777085.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/xavebopil.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/kidadipifozadudor.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/7289018817.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/fejuwazu.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/mebuwokitelufuregune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=exam+fm+study+manual+pdfPDF 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_off00014be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE5 16804 bytes
SHA-256: d59c6c832281e1f2771ef9ae69c6dae408d338df893e20ed5edc9a68d7a67b20
font_01_sfnt_off00017759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17759 10512 bytes
SHA-256: ea014796d9837db80fd034ed8d58e36107a111dd2f1f48477a2ee948f781b7e0
font_02_sfnt_off00018f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1