Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea040372bc20ea96…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 03:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6c11dd66544f641eed47b47469f5c06 SHA-1: 6513fb275b2ef2bdce446f95dfb162c432805746 SHA-256: ea040372bc20ea96bffb8886a726c15684511e5db38ee65f554b24cffe557df7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs and links to potentially compromised CMS upload storage. The PDF structure suggests it functions as a link farm, directing users to various domains, one of which is `https://allytemp.ru/uplcv?utm_term=bad+ice+cream+free+game`. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=bad+ice+cream+free+game PDF link annotation
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xukibimobakolon.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/napelatodukete.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/8369617622.pdfIn PDF document text
    • https://ka-base.no/images_content/file/23139423503.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4d2472ca4c62924e7af629857d88f4e7/76683648915.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/jamotona.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/ganoxejapop.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/jirurulomukanavur.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/65033349297.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/79611424156.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/99161062179.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a7da0087---45805772177.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/83046312897.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/xoserilipasikadoraravo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c44fb2d8f87ec85bfb200b259b782952/56213563264.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/sulokenanupizenizawuxafa.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/88333790783.pdfIn PDF document text
    • http://apsons.eu/files/file/2591135821.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/joziwetagofujanelevugisu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee50d1d76---81866032358.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/17945723123.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/nuzotukaxazizawet.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kusafididopekadugetoluwu.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_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10336 bytes
SHA-256: 31c4e3ec1a377fdaf56db2aef9b6556bcd65122c78a15785f5a17b2a6926c0b2
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 17660 bytes
SHA-256: a08e2a85e02da5f4b9078073ff1d4f8d0a2ce69ab0bc696416969e0481aceede

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