Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c5bd0f51f7cbd8…

MALICIOUS

PDF

134.6 KB Created: 2021-09-23 11:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3cb5b03abd0837ea0ddeb6fb2127d3eb SHA-1: 59415d78a080cb5987893f8cb7a8f26c9ec9cc09 SHA-256: a4c5bd0f51f7cbd8a427edab90470364294a11ed8788e0918cd4d54626aa82f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious link farm designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://coretry.ru/uplcv?utm_term=toronto+android+apps PDF link annotation
    • http://vlajkylevne.cz/UserFiles/File/rowilijo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/86727299960.pdfIn PDF document text
    • http://ukrfirework.com/images/file/vuguxiluwejurisapidizevug.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/206645e8f7a7abc45f45b9f9f1daed6f/nizosibemifesatileraj.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/vimudimepulobika.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/widuwobulisegapived.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320e6aea26c---dimemavat.pdfIn PDF document text
    • https://badrivishal.com/media/rejurumikefazosakujed.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/vavobepesape.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/56915997055.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/66234602762.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/35084605714.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/nosifonerinoxabovizas.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/mumazoju.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/61207087814.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/nesonazatugikuzudit.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161330f244903a---kukejixitavadunegi.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/supazara.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/73155602391.pdfIn PDF document text
    • https://pratham.one/file/winokerepagoxewa.pdfIn PDF document text
    • http://hanleyresources.com/images/30312862587.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/wilelijumafe.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/94733065755.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/983256624.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/48107734912.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_off0001aaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAF9 19740 bytes
SHA-256: a0124ee4cb8de4417615b3dd900a36894c0e5a39ee18f56f73669a3c4e1ccc94
font_01_sfnt_off0001de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F622 10172 bytes
SHA-256: 2bbf857e0c2f0c1da240865b50c7d7d5f0c1a124fa84def1f3cbb1967f5462f5

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