Malicious PDF — malware analysis report

Static analysis result for SHA-256 de236c481c8af0bf…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 15:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a8c809eb261f821e55a9439f39a474d8 SHA-1: 0de06b594dcb6dbe32c9908848cf5e84c699f3e9 SHA-256: de236c481c8af0bf4b0be11af67bbd1c892ce0bab1671c82e77e543de41a7054
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=every+praise+is+to+our+god+sheet+music+pdf PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4ddb2dab---43904204160.pdfIn PDF document text
    • https://grnca.org/img/files/files/55234538181.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/65180050980.pdfIn PDF document text
    • https://langumeistras.lt/i/File/gitesunidezevejetapoxu.pdfIn PDF document text
    • http://splogservice.ru/content/file/zatiligoseworonunidezo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/pukavijigefupiditijadax.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e53e043e---58644512686.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb545674e---vazejebabuganijix.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4fj0e2199o1gjff4tf16iejis0/68154513886.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/29213899377.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tiloduja.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0b11686f---20468174876.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/liwuxotofidi.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/vusowixojewoliwaxofate.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4bd851939---67659579156.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ad535ebffebf27f9ca616d4cec2fecf/33174213948.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/98836189835.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3oe9mnurn9ibrbnncu3rlbbdnh/texidepurenubobarexozonow.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc880601aaf---87944524333.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/84bcbea9e41ad807c89288e5a9e771dc/fezikajomit.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c09e837ac---51588669857.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/5665525721.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160886b001c4ec---47100124598.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/94637008855.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/nusuwapeb.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/78832662259.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/jafes.pdfIn 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://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_off0000b6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 14020 bytes
SHA-256: 70b630dd8a789d4410e85cb741e97c62ac8205cac09332af557094299d6a60ae
font_02_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 11180 bytes
SHA-256: f95db3b2515f3cd9ea26f60e597ae82d8b2df25c300f89d4b9e3645af72b562c

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