Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c924ff40ef1b4f1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 07:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c96ffbe27d0545e1e9bfae9bed5d979 SHA-1: 9c0efba2feb3b69bf2d8bf486e9b95655d8652cc SHA-256: 4c924ff40ef1b4f1815e5a25f34c6aa680652be40f29df13c1b41013e7894a0d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and heuristics point to a client-side exploitation or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/15a0c44673926688135ab9a0b753f67d/85291554570.pdf In PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/87163572886.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/m91fhq6m112i4eut5hokg80aio/86725323801.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vemamoxifazob.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/wixokutitolakap.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/28449452294.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/54937078468.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d099fa8c1c---pisemun.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9d1c83e72---45197145808.pdfPDF link annotation
    • https://weboonline.com/ckfinder/userfiles/files/45325424245.pdfIn PDF document text
    • http://www.siposferenc.hu/html/38770451709.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/risosodijelugemejusas.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/jovexakatales.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/75436998726.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0a60945e94647af0badeaa1ed3075bb6/gidem.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16102c0276abb8---85592000866.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610296f995288---zigosizit.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/88729326819.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/87114238799.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/56407467464.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096269acb165---sufizadudarulanod.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/mazabijusejowoxosiro.pdfIn PDF document text
    • https://umartravel.com/files/62839843135.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/76984090323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=research+project+report+sample+pdfPDF 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_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 17788 bytes
SHA-256: 341e9f0887dc735c6c3b7154fff0b2653fc6a7b844568bfdba3b32eb971fbfa4
font_02_sfnt_off00012d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D40 10864 bytes
SHA-256: 6c4846430a53ccbb21d1f94562156b6eff17af297b90a8dbdfc088961644f611

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