Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfdf9c1c12bb97c…

MALICIOUS

PDF

97.6 KB Created: 2021-06-08 21:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 16f85a7ba50a9ee7ac46a34273620339 SHA-1: 201d5acbd9ab10ee520e5e5bafef349503739c4d SHA-256: edfdf9c1c12bb97ce577996a32f0bceb39093034297512941b321c6fe8903376
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of 'wkhtmltopdf' in the metadata suggests it may have been generated programmatically to serve this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://ketchas.ru/uplcv?utm_term=rkindaleft+boss+locations PDF link annotation
    • http://arcomproltd.com/userfiles/file/bejezojaleweb.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f7ddc979---fezatujimafawinurododuvi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/vd42brn1upjsgqb7lartnht5af/kixogutesij.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c18689ea9---56037263639.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077212c1a607---mosezipinumetu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/tobopagizikapidubovef.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c2730acfb659bdccea62ba365bccd2c6/55262166413.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4473bfa3d---risajiga.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/65309185926.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba03240695---tesetasasazepanofabeneg.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/163ea9509d73617a099d009a3bfac89d/23785178612.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/15478542347.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090c15de2fad---nawelexawegemaga.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a2faee9f846937af36b2b220268f2b50/difogitagavazenagubebinij.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc6173515---12673651155.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ecb8679209db911d3182fd0f6484f1ba/35413646847.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
    • 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_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 5132 bytes
SHA-256: b0c9d0872a50f622fc3637891ce2ae3a0a95285365bcd6527091d16311387028
font_01_sfnt_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 11696 bytes
SHA-256: ee18db1646d48e92434e5412efec0392a24b122aa0a6c82fe4cc640b231271dc
font_02_sfnt_off000162c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C1 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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