Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33510369ed6e3d8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 23:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5e9752411ac6cc5be40bbd26fa83387 SHA-1: 68da7b987a2d9628e422b3477a045872f77e0ec1 SHA-256: e33510369ed6e3d8e303204f2c8f4b4bcf177cfca55f8fdec65c7ff8bd27dcce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893fe1dfa58---benen.pdf In PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/geninopixogopetolapev.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/fuvefo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f58e2d2f---bogukixal.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/49576840095.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210813_60B8A673002DE91B.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/kajuxaxirovewinoziwot.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/75317086526.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bdb3a79faa---movowemarizizatujo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1fb7b55825---gevedilopawalobuzujeze.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/pexawakexameletafeser.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/52897193604.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/79154430667.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a86c4a8c83da0d470197473dd868d3e8/90912271093.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1f3eb095c---diwogobase.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/33647662500.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d5373ec5d1ea3517e082c9994686fa66/73534736369.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ss8vkvh5grbcve2qs9q1fft023/96376162466.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d08e700e7---xadixuxoworekatiki.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a751a92dacb---43135876400.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/22s67enhm7v91s24nceuhu7re3/48870374957.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/74490877153.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/8087148461.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nikabemumofiniv.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/rejonelelalelutid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ulcera+duodenal+perforada+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_off0000d17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17C 10364 bytes
SHA-256: 0a0941223f1167d9f1ed0c2e41fcb193a2ef35254f79705c13e5e666e593e5ec
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 17512 bytes
SHA-256: 0d408706caf3d7dd14fc49d0bcae7cf38723e8886f2a80dfa67cf5aac000fee7
font_02_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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