Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a1a8cb5672693c…

MALICIOUS

PDF

76.2 KB Created: 2021-10-04 21:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 50270b3226440e21076541b71b6d59f4 SHA-1: 8228837d6cf202e51bc09dd483159cd627ea6ff6 SHA-256: b4a1a8cb5672693c80a5e39b8ce85a505bb65e243adbc3d99cfe04bd12b3fcea
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://e-baze.lv/images/site/file/43945417186.pdf In PDF document text
    • http://vizugy.hu/uploads/files/files/bomenekixo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/fidowowosup.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/198ddc3cbb45af0c4e5eeb7bc95596ba/kixelubaxiz.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/tegakul.pdfIn PDF document text
    • http://kechengchem.com/upload/files/27761021379.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/taruru.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/9456631316.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/wojusuzokogan.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/pufanumevetilavadowo.pdfIn PDF document text
    • https://superpart.com/files/19549913467.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e9af1a1274fb9ba67013d9f8735b1da4/98328332033.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/2843946721.pdfIn PDF document text
    • https://morabia.fi/images/file/tukifipipenumabifi.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/riduwan.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/50399260140.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xekodafigalinuwuduseb.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/43379696822.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d7a9e9472ff907e00b1199d9ab5c1859/genamov.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/xepuwumagifetotitajuse.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/97246802910.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/77648533011.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/fugadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fusion+of+pearl+and+garnetPDF 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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 10748 bytes
SHA-256: 3446952e509b69485163a5c22e9ae9062066bf05e1c15edfc73e31fad88914f4
font_01_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 16496 bytes
SHA-256: ca4d1366e5decdfba4a9a77b9a252fbbc95f140f9070bf4ead24f1f673fe905b
font_02_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1