Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1327bb3455be15…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 21:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3ddab57957a20c2280b2031a8f7ba941 SHA-1: 8e0d5e3acb9bcf2c4035bf70cd1d0071de1f9c56 SHA-256: 8b1327bb3455be15f8817221c56391baafb7c3e63e43a3c8f3d13a97f5a600fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=pdfbox+2.0+create+table PDF link annotation
    • https://cqc-material.com/app/webroot/userfiles/files/97254417245.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29182210635.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/wudopawubi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609868bf6a86f---6682465305.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/8807329791.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/88983886995.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/gafikojukin.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/40090953971.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/tajexemeborigozebog.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a3fefd1374e99ac013749cb7e12f2603/12573563590.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbfb978731---xosiwatodosidepojizuzi.pdfIn PDF document text
    • http://centronegozi.com/public/levedelajubejobosinatewi.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/bavafigatubefilodud.pdfIn PDF document text
    • http://esistore.de/userfiles/file/35175693702.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/42744866883.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a020207022a---45226823796.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/mutomug.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69cb78591---49703178363.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926b06dafb---viwixat.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wirezinewimenododojabeb.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/58415958342.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aeec1f91e---58003408265.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu7tmccqojtsfaqkbekadvd5un/42308294498.pdfIn PDF document text
    • http://surausa.com/uploads/files/7418229529.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_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10656 bytes
SHA-256: 4ba1d3fef054ffae0a1d4ea394b7213f1a9918ec50674bcf40d82cbfe0effe20
font_01_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 17944 bytes
SHA-256: f99a0e3a361636c7c7cacbf141958072036b29d9b3ee312d1b56abdd963f5f93
font_02_sfnt_off00013f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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