Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39c253f032494e7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 17:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f26f226f9b42b60f934fedd4c9d8337 SHA-1: 96fee9a4bebc7906e9353a0977c13629a1bbdc43 SHA-256: a39c253f032494e7bfedbd5413c9c5f8b61511b5d8f32bfef301c9c81d5bcbbf
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed for SEO manipulation, likely to lure unsuspecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=how+to+delete+data+from+android+phone+permanently PDF link annotation
    • http://mlead.net/images/e/file/98057450196.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/wozateg.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/nidunafufabiso.pdfIn PDF document text
    • http://kammed.com/userfiles/file/88609751417.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/negoxul.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/lajipiwaku.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10cba745e---14908202599.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/zejeguxuwogunuvipamonebu.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/jaruwupofofilexoniza.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/puwofesulojude.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/wumunadanuw.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/luruvumisuvajepulivuzola.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/76099942495.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/pagofudupaxiwebi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373dec4520a---gisibaxavikolom.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/79b637c3ba25f7794efa418d223c90f4/moxadujagogi.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109111915262590.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c983ef22c---sibupulilixa.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/kanabogazexuz.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/24788824278.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/22696254194.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/fofirutawezijow.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/4642456792.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc45f93f24---jewanomafifat.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wanusof.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_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 17620 bytes
SHA-256: 072048942b27f183fff8206f745a5793bbc638f47007e1713f515be63b021524
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 10788 bytes
SHA-256: 0297ffe08612cb9f9a25fc2c19a3824edb3eb4d657c3e3df802ea600f3bf6d3f

Open this report in the interactive analyzer, or submit your own file for analysis.