Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b2e2c5cbca5aba…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 22:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0775b8ccc3a4ce5af7f5aa337ffff61f SHA-1: 2fb582cb11239d314134732cad0ae2c836cbc062 SHA-256: f5b2e2c5cbca5aba1292d77d46b3b888fb3257fdd4f4fa2862ea534857a30098
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of 'utm_term_redirector=True' further supports the idea of a link farm designed to manipulate search engine results or user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/25624571111.pdf In PDF document text
    • http://kietminhrivet.com/upload/files/sudolowixake.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vukavupib.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60616771118.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5a79da88473e93e79c658a6f7870f4b0/76133014308.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/69495904839.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f610430fb9---kilavipokunawuk.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/45424269241.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614202c529d55---72513885917.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/779a293a45d16505202ed37e8bdf065d/8363822547.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/33598685816.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/2560249524.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/refanos.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109020537043882.pdfIn PDF document text
    • http://henca.com/files/details/file/10189297912.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ca5618a7---90890626395.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161343633352ef---pidamuwopuvovulel.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134528c818f2---40668601601.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c54b747c5d26abbce5fc1e93051c6ce1/83915435287.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/fadelisisogekumozowetedud.pdfIn PDF document text
    • http://prograsifkalip.com/files/51025899070.pdfIn PDF document text
    • https://bczenekar.hu/files/file/50454699720.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/ruzorevev.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/27147969974.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/35059576630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ka+pae+ranasingam+full+movie+online+watch+freePDF 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_off0000bd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD24 11168 bytes
SHA-256: 7a0074ae1fc5546c5efa70a7d7eeb709dceb26152e30d8591c0842c3b7cff921
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 18420 bytes
SHA-256: 03201f3e523a3afcc71799473ec15f020cf919b95c61e50bd5bcebf187cfa35b