Malicious PDF — malware analysis report

Static analysis result for SHA-256 456de88aac1e30cc…

MALICIOUS

PDF

73.9 KB Created: 2021-09-29 12:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b25579ab7da7719e45ff14c5d63a68f SHA-1: a556878c9bd3a52b6c5cc23c392031bcf63a9ec9 SHA-256: 456de88aac1e30cc83999bc2e198ce5113ca23a88033ad4c5719453fef8e1b6e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=holes+louis+sachar+read+online PDF link annotation
    • https://produse-zilan.ro/files/11141779800.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/danafekesik.pdfIn PDF document text
    • http://anpo.vn/upload/files/lapajirafaraven.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/tewawiwadoba.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/faxosuwujefurodi.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/pesut.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/33487180448.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/vuzixajesefi.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/88891043569.pdfIn PDF document text
    • https://aokman-drive.com/d/files/94104322482.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/mimejiwukututikokip.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/42572875717.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/kibusi.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/98779139571.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/4556297380.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/83802837593.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161438b7631bc4---mapurumanodijubo.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/74128203274.pdfIn PDF document text
    • https://swiz.eu/files/editor/rovekimazazaxexo.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/ruvodive.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392930a4ad4---99974494153.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/vevevigemaditoxevataw.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/72123134582.pdfIn PDF document text
    • https://guijek.com/userfiles/file/tonolu.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/80728317601.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ec4b805feb09ae18a84716304a2d187f/sowegitigikomotidet.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_off0000bd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 10460 bytes
SHA-256: 7785ae268d4e8c232926ddc2a3b37d14784877b55f60d0de406ce2c6f770ce8e
font_01_sfnt_off0000d4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 17880 bytes
SHA-256: ced4c6b20224d16a7b6e18147ed9f52c4445b2d13c218b823a1f6105ce1f66fd

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