Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a87d69eb15f565…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 07:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f59c1ecf12c70fbe27b6130ed1e3383 SHA-1: c4a751d07a72d205b8f8376afcd0b68ea00ccba0 SHA-256: 15a87d69eb15f565e41b7e31b6d6f9871592323c1377d36f323f438ee3da23f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ccbd35672---51400173341.pdf In PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/lofix.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/niwebebuniroz.pdfIn PDF document text
    • http://immopolignano.lu/images/suxetofajokuveb.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/jibojodiwid.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/44429215375.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/acac6d7ea653842da40d837fb9db0d41/1107661479.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/61324575945.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee36686c58---76890571904.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/38407459363.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/57752221998.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c468448c98e---xebotatoxudaj.pdfIn PDF document text
    • http://dytac.hk/userfiles/24360734510.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0do078a73gf784v8r4ufgldm92/4696448013.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/kuworedapubojok.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf9984e5c---titebeza.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608689304a77f---xapikolofaf.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/61562958290.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/ribifitudujikikuz.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/42f79a3cf4ce76b02c2085608b97a0e3/sutigopapewewomar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=crankcase+explosion+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_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 10740 bytes
SHA-256: 080feb7d8f45139a26a0d5d01221ee0d772cbbd2edf04e687b902c8b1b7877c1
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 17860 bytes
SHA-256: 20dde86ed2932e432e29948ec170e458fddcaa57294dabdc2dbe244b37a27900