Malicious PDF — malware analysis report

Static analysis result for SHA-256 457065a3425d0900…

MALICIOUS

PDF

70.6 KB Created: 2021-10-06 15:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ec3f9674dce211a2031754ba974b004 SHA-1: d1b4a2ad41f7af802edf379ff85e5fb90096b046 SHA-256: 457065a3425d0900bbd246199d97dde30506c26c04b47e21cd4b5198e4b4a985
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with specific detections for phishing and trojan activity. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF's structure and embedded links indicate an attempt to direct users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://daiichihr.com/uploads/news_file/dodiginavefimazezo.pdf In PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/tifoja.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/tudavapuvetepumobejobe.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/fimotilomufoba.pdfIn PDF document text
    • http://canvangdientu.com/images/file/xosox.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/55637971894.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/peberuwotudetaniv.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/buwijozenimugemo.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/tufuzubulefiforodu.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/69243589709.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rotomumuronoporuxu.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/17984865725.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/wububupan.pdfIn PDF document text
    • http://gptools.net/userfiles/file/jerekumilixe.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/84044544124.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9b704f20---tefetupe.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/82107229133.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/90216106245.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-23/20210923190152831075.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeae30f307---65891085623.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8fcfc8a0ea71fbb8f88387df4f3feb61/71024287061.pdfIn PDF document text
    • http://rotang.net/userfiles/file/4418579358.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/71855086361.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/91131555360.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/wopopivimezovuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=genotypes+made+of+the+same+allelesPDF link annotation
    • 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_off0000b154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 17176 bytes
SHA-256: aeb7523c02149698fe080c5e9a7e515165893c7736753fdd91e1e321fc90bcca
font_01_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 10724 bytes
SHA-256: a835b52de395823e6d61472f33b9c022d6c8e6c0e19a5946fd324437c65a5a1c
font_02_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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