Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b25c1609ae9729…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 23:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 129359c5d53fec3ec3260ec3600576d4 SHA-1: 7c988ee43ba4488e3cb53be1278d447be10a8f4f SHA-256: e2b25c1609ae9729cdcfb17f216af94f7787c92925cbcaed28ee4dbd197e739d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host links for malicious purposes, such as phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=android+emulator+pc+pokemon+go PDF link annotation
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/toderidetudakuwus.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/kujok.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/gagutawelijizolubevutabu.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/28976207768.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614efc35df819---75861050638.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/26534154060.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140751e85e13---suzizimidijerivepotiren.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/55642502631.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/63903619695.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/gunixo.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/51750424716.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/fexadazedibunami.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/gugekunajobedajib.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cb41afde3b9034e86dba16f783aaebb4/38499254855.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/gagiduxosej.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/92652195807.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140965092667---zubugidezitabozobasesejig.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/77811481657.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/61568646279.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/67659805479.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/8199495805.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/wixivuk.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/tesevosimetav.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_off0000b124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 10864 bytes
SHA-256: 1ec0f534b4d174ecf0696626fb29f2ca458cb754fbf034a21ec6f325af99c0d4
font_02_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 15180 bytes
SHA-256: c8b1c585ef596cbf98985a3ca0fdc2d954795220b6c279e50f20c8e947321aab

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