Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e2b2b3455bae39…

MALICIOUS

PDF

97.4 KB Created: 2021-09-17 14:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 373c7cc67bd25c96e32247143a88bcf0 SHA-1: be31ca444bced6386778918c31b3c9bd07a61d42 SHA-256: 96e2b2b3455bae39ae12912895b495f3f70926c8d5414b9135eda9059848e9b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409fd8d2e47---jafuditerixolatoferifa.pdf In PDF document text
    • https://atrax.hr/files/nesusega.pdfIn PDF document text
    • http://bamor.org/userfiles/file/80000105056.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/tamodisubafisugijexedibud.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/99899859599.pdfIn PDF document text
    • http://hkalc.com/userfiles/domobix.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zikunonexib.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/19662132712.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fubonoveleja.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/94647596758.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/39854337253.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049449941e---gevuw.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/pilinerodewoxizawusunawu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/vufokirulofad.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/pitifuwefi.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/52654132203.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/14358819301.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/69964517682.pdfIn PDF document text
    • http://tayles.com/uploaded/wowejositowuxabugevis.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/60276473487.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc709e5f19---wogozijenukulipi.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/pulaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=walking+dead+season+11+episode+16PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 10676 bytes
SHA-256: e9e8a8d6870ed736c530e2f1ba3d0d962ac71936b2f1ca1b21b39e2ea80b151b
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 16832 bytes
SHA-256: 760a965d872297b3bffb399e147f4b23a7c46202f5805abbd32e47752ecd7e70
font_03_sfnt_off00014752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14752 18564 bytes
SHA-256: d0667f87d870148147b697b9060681a28ccb42efe722472224c1f423d14cec5d