Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fba9384b35a13c2…

MALICIOUS

PDF

84.8 KB Created: 2021-08-02 03:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d29ad1104a559a557bedbf60ed498cd1 SHA-1: 0b50e929c8deadc7085e110f3f8ac6c6c1f19323 SHA-256: 1fba9384b35a13c23c83d2749c919da1b42caff79b678dfcd0a1e1b4ccdcf454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://drafthe.ru/uplcv?utm_term=how+to+redeem+codes+in+idle+heroes PDF link annotation
    • http://studioindelicato.com/userfiles/files/wuwegojadasaxoxarem.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6bde465efffa3a0f0f06c1af7899a49d/23030706724.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/jukemifipexulezerawudadi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d6e2b958---44837901080.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ukiq3141snepu91ou9ir1r5ntb/sapux.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/23233412919.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/mobemi.pdfIn PDF document text
    • http://expresskaliski.info/file/24536412250.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/pujutilugapiro.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/fukiwilowiketabomupizo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fbn82einac3l7tn5ghsgjh9ufd/9542402149.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb8784689---65899495076.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/80169518874.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/defuda.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcea404f7a---5478947566.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xevalutexizajusi.pdfIn PDF document text
    • http://etre-belle.su/images/file/52065280676.pdfIn PDF document text
    • http://brlairport.com/images/file/minenojozobut.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pas9vticlnkln9vkcf2o9onvbu/44053039802.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/91103120428.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210603_57916BBCCF4A3A77.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zefulopozadal.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/mebofaxurobegex.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ba631ac4dd28eec82a23cfb26aadfa54/pasidelikagemufojewodetig.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6c4b32c1---602579885.pdfIn PDF document text
    • https://lecachet.fr/docs/files/94746685043.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 17076 bytes
SHA-256: 7c8df9974e60d3b477bd4929812316863c33a9ddf313c3a902497e3d7c780d30
font_01_sfnt_off00011477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 10552 bytes
SHA-256: 6f98c2f7314930cb51bea7a2f4fb3fee986c837163e4ab11138037d7fb97dcd1

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