Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fe72c315a7a44e…

MALICIOUS

PDF

99.8 KB Created: 2021-09-02 11:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86b9596c8d3011b0646edb39c947dc4a SHA-1: 9c94a204fc64733bc518d166cddf71b6c54e493b SHA-256: 51fe72c315a7a44ea5e02b3648f0b9f3508ce8ea97c760015d511c19876d2ea4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This suggests the primary purpose is to act as a link farm, potentially for SEO manipulation or to redirect users to malicious content. While no scripts were directly extracted, the heuristic 'ML_NYX_PDF_MALICIOUS' and the nature of the links strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/07585b63167b103204be733e0b2c4a12/dozefatazinokidoz.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jaum6fq36qtu7o37cvps0g883n/58428433558.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091052dd3ca1---kididaminivujureruzibu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2vmkgf3l7u2ajnog4skinco1ek/55135262949.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/94112086535.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/tumatejejopuromo.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/dizor.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c8db4466e---15012737844.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160876176ab746---ligugede.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096277ee334d---28450454597.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121796db20ba---vofazu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/cm9r8tmghf7bk3d4lbc9nfpbge/namewevurofidokevo.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/varezutemazusobijuxoxizus.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609843ed341ac---liwigamumefiwazalenabime.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/rir47064ghmrsa3eukngsafu60/48187637908.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/70b69570e15896d01d32986771aec31b/28374385668.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec3bc5870---kateweferuwilezonij.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/rinisesumafomiga.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/wojewazoderifexizuvopiz.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4833ebff4a27fd8a16ef7fe19b517ea8/40668493289.pdfIn PDF document text
    • http://premo.at/userfiles/file/18738387277.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/4c657ebefd8196247e4274fa327b30e0/53590203040.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jbttg2a0cvnak4reeqo176gr0m/146027226.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/merugigipawapinav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=elca+transformer+catalogue+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://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_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 10956 bytes
SHA-256: 74fe1c661bdaece94f102f4006e2965bc6175c70be86eac92d41149ade1056ae
font_02_sfnt_off000152fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FD 17792 bytes
SHA-256: f44511bbcb96dde2c70fcfe751c4acd96e50a952790778bf2fb9ae68ce78a5b7

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