Malicious PDF — malware analysis report

Static analysis result for SHA-256 950dc4e09ac9ac45…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 04:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6f51c1a649d55e646d0be1aa2a64903f SHA-1: e646b67504c48edd7e07c509a35e5643c3c1454f SHA-256: 950dc4e09ac9ac4548dd6b505716aec2ce63281dc9e231952e98b812bd725896
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests a link farm designed to obscure the ultimate destination and potentially distribute further payloads or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • 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://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tm5i1pid616tp671gnahvjfm8d/xupupo.pdf In PDF document text
    • http://coyada.com/up_images/up_images/levizavoredi.pdfIn PDF document text
    • http://emannsltd.com/userfiles/86718196430.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/fosujevevagip.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/67804980428.pdfIn PDF document text
    • http://falerisztika.hu/tmp/48772848785.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607149f49ab4a---gefojem.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/pulefolapibizevutixova.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/90571728808.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/bozemifimil.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609128b250798---rasidag.pdfIn PDF document text
    • http://proxima-design.cz/files/file/58788658123.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/tilobipagufenuwisewu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/rinerugolebozukejozob.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/662ehum7kja6if8ll4ss0doj64/79161103412.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/funeronuvuleleta.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///4110807443.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612cfcfcf26c7---52609382491.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85de93e48c---polone.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/golebemokomibakojof.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e997cf1460e634728603f98be95f37c7/21984650025.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/zisegapimofev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=convert+pdf+files+online+freePDF 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_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10424 bytes
SHA-256: da05baf22d7371615e053579ade7ef67d62274a003704a86ce535565ccce8efc
font_02_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 17836 bytes
SHA-256: 1b7afe434543f90f7aad82c205cbefd36152f232144700c9c26de3acda97d2e7

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