Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8807b72052f9f8f…

MALICIOUS

PDF

74.7 KB Created: 2021-07-25 19:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad0e49003f2ac4736a021e2a1a1015ab SHA-1: 92576f60a2d6cd71c0c34150a5bea25791c6300d SHA-256: d8807b72052f9f8f21c58ed6481c60e2ed62238424627fefe32f94d5f958b3c4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as lures for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6867055a59---furapimefa.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160773efce73e7---kubasi.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/dipitunadexidowalezu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/c64ef6ae3cfb988d22712ea5feed1ccb/27310103966.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/od166tltful7vaultrjbh4p8tl/99979263880.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/15d9f2a51fd3da75741c318a15cdfdba/lifakizi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe8b05daa---kobelatenapojulid.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/kavujugebaziwegiwazevij.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/forizarawe.pdfIn PDF document text
    • http://hodori247.com/uploads/files/ziwemizibudefop.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/57888865573.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60DE1613980D9.pdfIn PDF document text
    • https://thenavyaindustries.com/ckfinder/userfiles/files/85374905648.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/87ac3f41ea86c55dfa70f8994b295860/4488988534.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/gizaj.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jibozibex.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5597e46bcc8d8cddbb41a34807265100/85998952595.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/vanazalaju.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc230d118a4---wovusir.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fed5fb24---14762910238.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///foluzexofofepo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jajigunukusetubudidosu.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/92200085757.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfd667955---46630057342.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3c3b84693---19395207182.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/73164132169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=haye+ni+tere+happy+birthday+ni+mp3+song+download+pagalworldPDF 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_off0000c0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 11340 bytes
SHA-256: 37f8eb04ecca81666a11f7b8fc31166b2f52ca47206c00758090c8a4278f07cb
font_02_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 16056 bytes
SHA-256: e83a614fff24dbb540d08ae95a749085c1545fedc4b8868dd7d45ffc84a06d20