Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0db85d50e53772…

MALICIOUS

PDF

85.1 KB Created: 2021-08-02 18:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7e891726583042f2690df537ae0b62e SHA-1: 327fb10ee75290bb658d29538dbd7eb2092545c1 SHA-256: ca0db85d50e537726f10cc5fc5eb11312c0fb38618ecfa4f77aead06b428bd90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of external URIs and the nature of the URLs suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://szentistvanpatika.hu/upload/file/29472229365.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083844f763d8---xevuz.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c741ed7cd3---46426552987.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/19414665929.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/39044523676.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mumet.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/17396106565.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/b12f150b5d3c9f4ab0b0645d98fe5e1a/58540345976.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/kudusufulibemuwunu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/19034431417.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/vixapa.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/87275096516.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5fa775db1---23681232406.pdfIn PDF document text
    • http://sam-global.info/files/file/40530184871.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/96584657163.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160872cb2bbecf---pifulob.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9a43f3b1da3622f3fe1ce8d4581e6464/tedatelezanabuwaz.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/widipovo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddbf04c1c6---77775774.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/45331492099.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3ad875f81ecc15230795d32e5734cfd7/42722795532.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/40436808382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=adobe+photoshop+cs7+full+version+downloadPDF 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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 11140 bytes
SHA-256: 4100683c252aa80ba318aedc917e63f2d90c790396815ad88ef0fbcf10190fdf
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 16600 bytes
SHA-256: 9a9ef99b178afefdd7699df8f1ad9410a79100616cf2390267d360aea7db5ec5
font_02_sfnt_off00012eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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