Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1921a224bfe550…

MALICIOUS

PDF

649.7 KB Created: 2021-07-08 08:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f3740cf6f8ecbc392c0404168aef0d67 SHA-1: 36cf743c6f7b485f9ead45985c8169333b9dcc8d SHA-256: 5c1921a224bfe550e29070864ad0cdedb1d22d7948cef2cf00da8f5c2c66f135
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload or conduct phishing. The presence of PDF_SEO_UTM_REDIRECTOR_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a lure for free downloads or phishing, leading to potentially compromised content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7635

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=how+to+open+unopened+crates+in+rocket+league PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5fd25f1e---jemudutepuwudi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9g4oblndd2ps54qglj5rmpvu55/jamebuzujej.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/7hgdmkf3pabpeu6r7bp918fslc/ronanodew.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/d5e78c6ed3cd1683e1f614606d01a46e/jonikomirefosakuluvafubo.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0f1ae4b48---11243168534.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/329fe5bf0c9ce8600c376186d3a4e9ee/50965211144.pdfIn PDF document text
    • http://mylodge-naoshima.com/80108429745.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f7ee4f00---zejolobarixapele.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074313d427b4---dapekukenilepejot.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160715d8be5cd4---pakemokabofopabe.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/6244725385.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/miboserigikagok.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b362a2aeef9ae11d3643f2184d24deca/zinapujilabaxilub.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/xililepisepakabir.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16083e7832c1dd---nilaguxape.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1smlj8bsd3ap3se6i4n69iopee/51481013681.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/muzunonorakofidofoluj.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/27069217723.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_off0009b247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B247 19636 bytes
SHA-256: 53e91e3a135bfe8ba2e338268cda2513b2060172b95e48ee107252ddd49cfd8b
font_01_sfnt_off0009e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E53B 10956 bytes
SHA-256: 6f499a22dbb5c69e5df5e0361b84335505e8608a0d8fbef7ebc02fb803662fb1
font_02_sfnt_off0009fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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