Malicious PDF — malware analysis report

Static analysis result for SHA-256 5551c3407747adb1…

MALICIOUS

PDF

84.4 KB Created: 2021-08-20 10:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 871b6b97568dadf0fa4a5d564228568b SHA-1: 5b5c1e4af1d5bab68b92c99a21582b86ce3afb21 SHA-256: 5551c3407747adb1b53ce6cc669d6329381cda5d55f4cf3f94b1b80f03ca940c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://pixomot.ru/uplcv?utm_term=realidades+3+capitulo+2+guided+practice+activities+sheet+1 PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609421bae827a---xitukogebozulo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/13113969677.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/40705687733.pdfIn PDF document text
    • https://coluer.ir/documents/file/nekeranewefupazefipobine.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c9b9bee7e0d042900006f5507d23ff01/tabojagukifapunuguxiwogi.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/novudozesebibi.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/pivovurojo.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///7099363358.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d09ea66dd8---jupinarowuf.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bcaa480c5d5---taxoniba.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/baf1d397c67e68b7703d1b1b69b90aa5/17706147328.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gekabimumonezawus.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c101f6d8b46---25754934336.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/66983690892.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d390350ac2c---84202020317.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zirujox.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/91612066745.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a9d115716---44816727714.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/xuzogizaxa.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/6759987436.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/u1n94s1ftbcolnomncaeuilkie/dogaburiwobenenubiminobe.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/mosivowipebiliwusalexozu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ec4e0660f0c67398d4338fa00d8103a0/93777443683.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d6974975f51ef3e2076bfbbc28cffe6d/nunazarumanowefolonaza.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_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 11244 bytes
SHA-256: 3741330cb645b2131b807e196f9b4512d00071fbc8ec52a55d1f49c8b12d5b75
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 18540 bytes
SHA-256: 890b63e2cb734a545cea3b9b6bc49a516498a845c1157b7310e3463b67eb4676
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1