Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fdd7c11c98120c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-14 11:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db060b980cbcd3ec475e392851a0fbb2 SHA-1: db660097dd94d53bf7685c158a45ede8ecdd669b SHA-256: 72fdd7c11c98120c734b7e46e0e4a648076268e9a8127345d0c59e312cda8442
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. These links likely serve as a distribution point for further malicious content. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 5

  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2a8c5f8e3---zerasutatebitowi.pdf In PDF document text
    • http://wwpokebar.com/uploads/files/rebakudubap.pdfIn PDF document text
    • http://cityfate.com/files/files/xosimivu.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/ravopuxifijabibike.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bcfa09ff---tokugolitefokelavudejiz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b405bc4623---weketaparigukolid.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/57813399642.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc79bed82---48248027345.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sudimaponifixikuwe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/730iitovn6anvnban1co4ehmhd/bezogegimagafag.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/86c5a57f0df07301af513354a09b7f96/kivoxozuninabiwo.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071401373435.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/disudivetopovexikon.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/31112288362.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/20622750015.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ecfb7e75080eb9cbd41d23ea72d77be8/82424711429.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b4a5de90641ff497a682f3dcb7dd7340/mavobagux.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/2117634895.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d793495a---17108904899.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/36e0bc02a9f94fa394781a0a5da9ab39/65150376226.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/2287683468.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160931b9ce9f3f---70612324786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5e06478a---98663840307.pdfIn PDF document text
    • http://autovoda.ru/upload/files/20901583420.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b78f70018c2f422f550914f2d2df98af/38036827193.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fcfde17f7445d44833429d99a113362b/luwodunebewakelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=difference+between+database+and+filePDF 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_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 17780 bytes
SHA-256: 2d15e7eb48750b7ff2976948ac079591349818d9210a4a98ce566c734d7a1dfd
font_02_sfnt_off0001307c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307C 10576 bytes
SHA-256: 9dfb45629736bf81a95ae186efcd3a6b203226f713118e62ea96f2daf5773f8c

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