Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d92b567c05d3a53…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 06:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c11047da625ac4ce6d38034fc7050eef SHA-1: 127377c015ccd02f776488ce81698c232d39f6b0 SHA-256: 7d92b567c05d3a53281e4dec566a381684ea32fa029dfecee235e5265f969acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160870cf28c22b---polam.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c30d1329efca3e097f157537ae62e24b/diwenajuse.pdfIn PDF document text
    • http://vlajamo.cz/images/file/19198136583.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/49ef8o4kln92ejdnsbj2atrtdf/fapupezewe.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/zipojixobunerimetufava.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdec916fa4---jigimufipobonilosol.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/88487333762.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6afb69aae---54260512295.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gidukupuxa.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/99177737302.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e244d776e7.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/gipibomev.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/81024236868.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/709ca8f2606088a02c7e0593e76d6e98/zakileda.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/boforunedugabirixaza.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/75032996321.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50301998562.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f916552b302e22e0c495e2a9f4f1269f/91713999274.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57644626569.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/fufomusepoxane.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/99283133114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stranger+things+terry+ivesPDF 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_off0000ba2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2B 15812 bytes
SHA-256: cf64fc0c7202612a9e2157aa57bbb541345759156565e78088d25013bbc2abf0
font_01_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 10476 bytes
SHA-256: 3bd85a27baabf482f1dcfe9b3ea04a8614bc5236263767ca28d80e68524556b4
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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