Malicious PDF — malware analysis report

Static analysis result for SHA-256 7381763108ca4cc0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 07:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a9ba245b8136f9dbd9afee0fc2215f3 SHA-1: f401f9343a03d7d8a5d8b567a131ca68f72edfc4 SHA-256: 7381763108ca4cc0b59a2b699c0359e1130b54fa00d6ad20fe2baaa17db061b1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. This suggests the PDF is designed to lure users to potentially malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tecs4.com/intranet/ckfinder/userfiles/files/39989127413.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/15799918883.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/1285175092.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/digov.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/73164970472.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/topapubipu.pdfIn PDF document text
    • https://sanidom.pl/img/file/54824185189.pdfIn PDF document text
    • https://icbacademy.com/upload/files/86081180953.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e6aecb613---84037611051.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/dukodujareken.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/fimoninetiwadegimugu.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/difaf.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5ctjp9g5frvh0up5pscuil4jf7/kevemakafumakobeme.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0t411tq42h64mugj9cv1jdkqq3/zididotuxe.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b202ead558---kanalikugujegofosu.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/25267083789.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/pomaxupurulujinedasolo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730282583c4---vegosil.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/vezopipunekugejilodebezez.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tumegizotigun.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/joxozumufazetejotux.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161055db50995f---tudofivopuvinejoxojiwabaj.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b8c02339f82fd3b0fc73bed5419878fa/62417281610.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160795476e99f5---51037899063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+sound+of+music+1965+full+movie+freePDF 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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 11132 bytes
SHA-256: 9b034b683d1192425edc4c1084dfe6953db6f8767f9c5d65e60e87b30b9ca7ab
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 17944 bytes
SHA-256: 940d3ce85cc1bcb045954bb099925a19605d8114342427d674b8d996fd9a753f
font_02_sfnt_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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