Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19371104011bd96…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 09:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a774c45c54fbd3bfef62da31fe48efc0 SHA-1: e1fc845e0836f87fc0343c150e0d8fbef61e98ac SHA-256: f19371104011bd96c3df6729649aa0778fc0df004b55aeb2807b4cb29ccd1c6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm likely used for phishing or malware distribution. The embedded JavaScript could be used to further exploit the user or redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=title+and+escrow+services PDF link annotation
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/64119052434.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/38970536744.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/vafunana.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/98300238186.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/jepotivudanejuru.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xidune.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9b9a38c84d08955aaf253f87e10364f6/bowiwimanitiwedabulegep.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/64188723424.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/vumezefer.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/55008611182.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd263cf2f6---siwifaxogofeli.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0065c1b1a---pozulivazixigitisimeweji.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aaa313a5565da75895eeb6b85fdedbc3/gofetuna.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pfoi4nbi5221kgn16q6k8esj52/bibuxakitex.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/2694587870.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/ligujupofanirojarotokuv.pdfIn PDF document text
    • https://drsaman.com/files/44341318143.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/gipuvugokikosuze.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/mojaniwabapusadonipiti.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/78589009060.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/46458484058.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/50543624684.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/30521220979.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9f7a33b057fe5b870c518e9db63b5782/74650106396.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/53934066840.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_off0000bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 10480 bytes
SHA-256: 0780877bad6ca61a6e5f22b90f5e6fb8dbc45ffe7c3098cad5728e3b5c243f9e
font_01_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 15488 bytes
SHA-256: 62c3acb03ead8d0d6b9c51d6270443f3b067bdd45651029482d56631e2133ded

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