Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6599fa61ceea61…

MALICIOUS

PDF

72.7 KB Created: 2021-06-12 02:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d1f58c4e1e13230c51b5834eb73a4978 SHA-1: 9422c30e7b4907ee60f9423ba4249bac5f157e60 SHA-256: 3a6599fa61ceea61e94e9b6e754881307197d087d303d6d60437fa554c85e01f
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous URLs pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=5e+races+dndbeyond PDF link annotation
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fc04fa6e43881f583b72ee80fbe27e41/12327195357.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/fadubufixelavisubizabakuj.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075956425c31---10190793377.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f257cbfd7---xuketuvakiboluko.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/38103547568.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/56435743122.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb584f48c9d---gulewevo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f0c94955---batufigepetejapude.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2711e0b4f8930f4550a7cb0b968d65a5/20626860580.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/gitepugogonuvibifimo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091232533ee6---15891190149.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/pavuxazufixa.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07a374be8---24918450494.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/42082340189.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/68619867565.pdfIn PDF document text
    • https://carlojans.com/cms/file/52599305246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 5172 bytes
SHA-256: 56536b4e8183f970331887d3fc38ed8f195da4f8f2d24d919f7d6bb610898c6a
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 10936 bytes
SHA-256: 8985e187863a1df8897fde2ff1d9659d75b13e132ddccbd40fb40120c1f29a40

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