Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea2b84fcefe8ffc…

MALICIOUS

PDF

81.6 KB Created: 2021-07-18 20:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f4ee022094d05542ff9ec32b1fcc76c7 SHA-1: 4e11f5e03a7c589ffa5ea32fdbedf225be8da9cf SHA-256: 7ea2b84fcefe8ffc20da723dafecb8e173f9c7a91dc48df0442a8777a55f1a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external links, some on disposable hosting, supports the attack pattern of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.amanuttarakhand.org/ckfinder/userfiles/files/73590911581.pdf In PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b180c870c99---46397635291.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/kififuwulebadunuliwe.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/komulumiwababeza.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/32940064934.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/sthghr2j78m0nefmmd4f22kicr/gukurezorug.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d61835cd---977558070.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c1026787052---salakositesopaverububa.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/13830605381.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/tebuvakatuzuvosiv.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///84423845241.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/sovulomagibekobijanixi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16990b4a66---pozizesajaz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858eb697589---pepoxipom.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/leruzaduxumudegiro.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/352b9ba9b3d538bd772233a5bcd01324/tokokimenexomuxodimopa.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/numekasebatejeba.pdfIn PDF document text
    • http://christopherdallo.com/file/gesuwuvasaxawufesefixa.pdfIn PDF document text
    • https://zold-kommando.hu/files/35361717181.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/xasekivetutoru.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/nvc5gph93ruhnmralc3p38176g/35113975572.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa560b834---8350280172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=obtuse+and+reflex+anglesPDF 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_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10684 bytes
SHA-256: 0464054bdb4220727dc63cf699bf06baee8559a33dec49b3f94995fc700be667
font_02_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 17556 bytes
SHA-256: 541bade638090763e235e05e7532d4025f515bafe1cf0ad1013801099e841ed2

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