Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d146ca733343949…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 19:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17337d61f59b27a286951595726ffc48 SHA-1: f03c9fc131145b72d234b4f0fb5899871e5440c4 SHA-256: 5d146ca733343949fc38e4baa21c07aae0acdd18f8beae295a8c7a12934837d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs that redirect to various domains, many of which appear to be compromised or disposable hosting. The presence of a URL with 'utm_term=android+access+camera' suggests a potential lure for credential harvesting or further exploitation targeting Android users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=android+access+camera PDF link annotation
    • http://imcborivali.org/userfiles/file/bebodafepajusarife.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/13214061333.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2aff4db324352b26a38a48e1d811fcc4/59586626090.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/q1pbe0jorgpdc8mpkdu5d82bb3/xuwumuraniwubigivivomize.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/18297014914.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16150fead1aedc---24550966482.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/denir.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/10311515573.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/gurafudotu.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/bukuv.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/92588559718.pdfIn PDF document text
    • http://sushi-belovo.ru/files/16652346019.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614d69e128776---filogod.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/98797320639.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/dofikudabukiramika.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/lolasuliw.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/bogatuwixuzaz.pdfIn PDF document text
    • http://sb-78.ru/files/file/saxewizawevivejet.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-26/20210926174327885475.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/31048169900.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f125723678---70995505027.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/93923707253.pdfIn PDF document text
    • https://binhvi.com/upload/files/33989597189.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/45605873163.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/xedejamufisufudufejese.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_off0000b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D4 10368 bytes
SHA-256: be108f8da5ed21e9aa828281f6cc5387fdc852adc50bf7365732cde12cc25801
font_01_sfnt_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 15540 bytes
SHA-256: 8c59837f41bf5deb0b109c9886bca0beec999dd245d9c52cb7dadd51de5f6f1f
font_02_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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