Malicious PDF — malware analysis report

Static analysis result for SHA-256 6051427e71c1a746…

MALICIOUS

PDF

99.3 KB Created: 2021-07-15 20:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 816e2a06df5b3e8452786f604ed08dbd SHA-1: 133518363360ab479f93e59e8ad4d7342b5a32e2 SHA-256: 6051427e71c1a74681a1bcc05bcb9ff4b940730e7b2912d625c69eeedd20ffbd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://arci-mp.fr/admin/File/16306730687.pdf In PDF document text
    • https://serviceservice.eu/userfiles/file/66940727221.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160737d8924686---pameluwiliwuwubita.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/11654386265.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8922bc417---xetokizewisaturaxorafej.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/28325078328.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/kevesupoburefe.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wunene.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/76731090541.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/tk0ic7sbgtaqdclnoh74l01rf2/nejonopozanivuvikibuw.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16072df5c18526---sufobuvinosutezi.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/genomekonoragod.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/jubovofer.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/vagetiwinepenobasomudiw.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/vukozizowi.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lilajez.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/766eoqka1tkqn51ttfjbdpsgs5/71775992482.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b0bf939ab3045d06596ea9f8fbb752e2/76434226176.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6db09648d---7009934180.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/sijiwejajijejubigoza.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a152d083576---91568183073.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c31eca6e048---nizinevadavefolawujafobux.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tbsqgclc2d4lg8tnuj0modpmfm/wesajuga.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2e977dd8e71ac1b2adbf81f23607cba0/wajaw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dd1f27273---95065043660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+was+the+purpose+of+the+federal+conventionPDF 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_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 16716 bytes
SHA-256: c3a0f0d24c017972af83d8bcf5b62c910ee69cc0b5ca221d2fb95dd0954c387a
font_01_sfnt_off00014e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3D 10964 bytes
SHA-256: f670d25fc0ce380e44fb32372f71eda641d38681762b27f6ebbb2353c00e9a97
font_02_sfnt_off000167a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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