Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54fa256ed83591a…

MALICIOUS

PDF

72.8 KB Created: 2021-06-23 01:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 70864a309f9abdb6cbc2194ac6543685 SHA-1: 94f1e8e77e426f42287ab05ac6bd63ff20d4455a SHA-256: f54fa256ed83591a6330124f0192425a2132dc39a4af365529ec91f09c2400ec
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b74469a5---12975614399.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1b1a94dc---33176054369.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/k6nsfh04p9fok9k27lmkv98jst/71262768598.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kujixuzujuxuzaf.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608687b10df26---nusep.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/pimololegasuk.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/rajimukifefebeniropavib.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc904499c---lababawafafuki.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4087197b---rosadatinijumuxeketikera.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160868498a66e1---kudidagura.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e0f1c066---radomunolowataxa.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4e90e4ff89d2e805f3d803cffc411a38/70500753634.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/nifitin.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa3b8369b---viwobasilesu.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/fovitekiguras.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=verne+harnish+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 5060 bytes
SHA-256: 2f2e3e8904214fc8f2f4d20fce05a2043c38f139a5a850e7ba67ef7c1fd3b68f
font_01_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 10632 bytes
SHA-256: bd6e5d11ffa818b1ec9e4ace14a372c47fcbafdbdb06026845b46705f4f1a115