Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a05cc643c00eaf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 01:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5c9e4e4c98770db2f675925f77982a6 SHA-1: 956b54c9d9e9f6bf013dc5c153974f9b255397a9 SHA-256: 27a05cc643c00eaf9c565794a159b70f9eb29ede8df236ff883069345ca83738
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains flagged as compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smolensk-bakaleya.ru/userfiles/file/peramenivefidetidopo.pdf In PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/906943107.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/wisilenigajun.pdfIn PDF document text
    • https://majubesar.net/contents/files/14881608471.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145b7709e80c---84516432254.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/voxokuxigumi.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/mivometilibakupejaw.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/gegodewepevinutuvoniko.pdfIn PDF document text
    • http://canadanur.com/resimler/files/lexixana.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mefawikojafu.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/38894100771.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/28160123239.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4cb4157e8d30e9ee9607420e60a68539/vubegowowutafa.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090416270827334.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/4016898775.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/69264781964.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d1f9fba92291dd036457764d279544ec/18066145471.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/87052406677.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/wiluki.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/jituwakexafijapoxitoloj.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/jemelaf.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gugalifovijoxanofil.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/89153828831.pdfIn PDF document text
    • http://jawarakreasi.com/file/pufudekigovi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b99a85d2---bonulavav.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/25191774090.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/97673456806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=english+words+starting+with+sPDF 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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 18480 bytes
SHA-256: b5e51e1ec593e165f5e996232fc4cc9d229a3d1869fd525db9aad0f07358aedb
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 10464 bytes
SHA-256: 76d4ebea935472e36e00bba5505482705d44076bbde60a15b23a1983517c86b8