Malicious PDF — malware analysis report

Static analysis result for SHA-256 7589a2cdbf910eef…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 13:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd2bec3aae0cb2ed3572244b5bdc9ddb SHA-1: 86244b5f7b0a30219730fdc0bd5dd72ce5cdde7e SHA-256: 7589a2cdbf910eefe24f8da5f9a5a835236b56f93003108358edb0de9279bf30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=penatalaksanaan+dermatitis+kontak+alergi+pdf PDF link annotation
    • http://barcabianca.eu/upload/file/zivosumajax.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335efd8be3a---rutidujelujazorujezibole.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/51239737649.pdfIn PDF document text
    • http://getem.pl/files/file/kulilitemememidokuk.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nutumaxonasedaladavusem.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/49427965002.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/bimutegedulexup.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/48770610216.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/gozebenejaf.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/penawu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202198159149774.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210907_235057.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613705482f9b4---265628107.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/72961717708.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tutusegimuxi.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/279684854613783db11bd3.pdfIn PDF document text
    • http://jawarakreasi.com/file/wapiwasan.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/vizokux.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/bekogogerojaned.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/ramededajepore.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161352f9393b27---84892039410.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/31717805009.pdfIn PDF document text
    • 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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 10936 bytes
SHA-256: ea23b93324daa73b2f1b15aeefeb0cbb3bf0dba61fb22f8a38fc1b723bda50d1
font_02_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16500 bytes
SHA-256: 912d899b045aea4e39782656a25d53768c05360693bda4e9e2b1c78cfadba093