Malicious PDF — malware analysis report

Static analysis result for SHA-256 27faec2807864045…

MALICIOUS

PDF

88.4 KB Created: 2021-06-25 15:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c079fdc9868e3d01c9458d4abfbabb6d SHA-1: 4e474acf6b94576e24a4292bfa8f7a14bc4e88ab SHA-256: 27faec2807864045ca775fa2b94d5b8bec325bb28846e4cb9c35c160b4572c33
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for malicious redirection. The ML classifier strongly indicated maliciousness, and the heuristics identify it as a link farm potentially used for SEO manipulation or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://crysiq.ru/uplcv?utm_term=quotes+to+make+someone+feel+jealous PDF link annotation
    • https://seitonsolutions.com/ci/files/witavavejebonezibeg.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e2ade0a66c8ba99bc96158a38c7945e1/tedowojibojoviwel.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75cce0b467---wuzakakifadozurigizoma.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d50feaee8---41911091868.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/18bvtqtd3c3r42i19v3cgk66br/doxazakezozogifu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fesefafopusovitozezibal.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/38944963101.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/f7cclcp3qpjcbslsudkcm5bcgi/82702288254.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/013daee0697f247504708542f23beced/gijekisekugujejevi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac9457742---kokeximuga.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/15023013310.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783db5962dc---80230805481.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/131ic6unc99ulks9bs75c1u760/84778839867.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pj7h710hgeqpa4k4ug9ronr046/dopijojavoberunukudiboj.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/makejopefuzuxigunexedug.pdfIn PDF document text
    • https://bursac.net/userfiles/file/29123156223.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xupazokonineguwawu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160795a0214d92---mamibebowovezubaregidiru.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_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10564 bytes
SHA-256: 2c1e531a0aa003e3fd908c49ab425a1486d73b5d6becf284a7e178121f38b32c
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 18588 bytes
SHA-256: 112897c2a1b1e2598018b3a36b94972c21b93474f399ce05e30ab8ea6968e7d7