Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaec157968cc16b…

MALICIOUS

PDF

83.5 KB Created: 2021-08-04 16:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe10b1d4d3ec9263a3e08ec74ab75a39 SHA-1: 12f36860d6941b5cb3ec63ed7b16483a0bf833e6 SHA-256: aeaec157968cc16b5c58523fcf4d0141ef41e2133591f9998af306f2e68347f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to obscure the true destination or host malicious content. The presence of a URL with 'invitation+letter+for+china+visa+pdf' in its query parameters strongly indicates a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7b65e113c4feed1ccb7c1f156c09b687/94748381460.pdf In PDF document text
    • http://pensionpoint.cz/userfiles/files/93280285060.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/27390453715.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/pipurixipobuv.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/pamonupa.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/79071556442.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/vujufe.pdfIn PDF document text
    • https://ccskin.com/geektic/files/86804170158.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cd901714---40283972328.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7b3634f16ca7442fd656a183bf0d3b35/fukukolegalupowazox.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802bd2b50c6---wevejesepi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15df5724d0---morinego.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/31855466928.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f496760f957288474504a4f04eb5fdd7/48936232774.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/40870482247.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/najalaforimalibafem.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zawibamuvomawofofinilesus.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/534759b6c80e8aee72bed30481f80b6a/tanufofenizikorawitipelaw.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082b896422fa---74142294763.pdfIn PDF document text
    • http://flexicourse.cz/res/file/39287518271.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607115dfb0415---9275181788.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/858b659d65ad67ad5c3f65a86bee6558/tedawer.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160724393720a5---fosimu.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/67357921422.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/8718117903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=invitation+letter+for+china+visa+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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 16452 bytes
SHA-256: 7667b9d708802d2980f577e0e76aba189477ad9cce8e218d8066e97148078e39
font_01_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 10736 bytes
SHA-256: 2285a7641e6dec0db40faeaf51e336618ac4c6c3b41c4b401f8256861660a827

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