Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e118d5f898b343…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 09:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ade7c8f562fb3fe5b131dad1d3e0e9e8 SHA-1: 30d286d0de97e6cc4a9cd19d4dbdc9ab04674912 SHA-256: 23e118d5f898b343ba57b43cbfa1cd7f0b274f85a31726691c9d5ef0d07cfe68
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1b3415ec7a8330d8760b91fc4d87f9bc/27074117717.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351657dfc73---zezeminofolisibi.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/wokesilira.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/jonanafojesifafadajitito.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143d3cceb196---64886569592.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/45253203276.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/pefatitosot.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/58lfklvme2bo6pkmd7jgds7uv4/dijitipamebalepebeguzuk.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/pugipura.pdfIn PDF document text
    • http://exima.kr/userData/board/file/limoxinapifedozow.pdfIn PDF document text
    • http://akademibt.com/resimler/files/dexipifimebexegekedisej.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/vituvafafuwijokoxes.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/79213167586.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/59980277519.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e7f4d3a7---22326457608.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/208101512.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/31062776392.pdfIn PDF document text
    • http://uhorder.com/upload/files/68604967857.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/21719202943.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/78147267069.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/469a5082f36d642116cd10dcd6e5e6f5/mewinuvavazonaxawewurew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=naruto+shippuden+ep+426PDF 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_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 10888 bytes
SHA-256: c4f70fee603b20e26a71cada15045a425c2fa7c9e57b4a0b4753185fa07b0857
font_01_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 20524 bytes
SHA-256: 6868e1a8400f2f0bd96628a139c4aa3d87f21e56dfe8fed36840c3a77d9128c1
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1