Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2645c15362f022…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 13:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eac6ee6643ca78235a6518f45cfdd6a9 SHA-1: a4074a818170eb4a1d97846650ab8642fc953179 SHA-256: cd2645c15362f022f7003bb250c7f0ffc30e10ca991998d045fa28864f58caa2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://garglob.ru/uplcv?utm_term=motivational+interviewing+addiction+worksheets PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d615662e3ce---diwosufenoko.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/39131629096.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/41846580399.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sodogudedafijubusopuj.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160731995c3d1e---liputovutewopew.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/900bcc7834956a35cdc2cf0466184960/9698592085.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xutat.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/71703373343.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/82852242478.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoxefipatepix.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vipofovolumiruk.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0906527001619890534.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607640c6c74c0---55551506181.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/bijuxikalujukero.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/4557897332.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/56d3f680c50f2adce812eec37b706781/fobaxijigifekeli.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1e57614dd8294c98ca88912feb20f754/26913577776.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/52279005838.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/paderusa.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/razorolisuzuva.pdfIn PDF document text
    • http://citra.cl/userfiles/file/56356100926.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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 18208 bytes
SHA-256: 38569b5eb4eb2c55807a10a09df091bb89c12549c4010bbbccac0afc5765c993
font_01_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 10884 bytes
SHA-256: a470ccde97a20dfd47286bccd2c2cb02804f673014e7370ff2c4cd4b79ea41cc
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1