Malicious PDF — malware analysis report

Static analysis result for SHA-256 a689e4fb78f96bcd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 15:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d62a05d398f035326e4dbf2bf41a2602 SHA-1: 045adbb9cbb266a41eb8fc97cb26473364cff366 SHA-256: a689e4fb78f96bcdb5d614bd069238ccf062d47d439ffcb1f76da6a2e9517da2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content. The presence of external URI heuristics and a high number of distinct hosts indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://polkovnik.su/upload/file/zatizawetikekiwisi.pdf In PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9k8g4k8bf1h4f43lhuq6iu60ac/43017192263.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/zadetovaxinunegob.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/855m98oihnspkggo3jlqpc0jll/58267580842.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e6f15e63---6874361217.pdfIn PDF document text
    • http://yocarbroker.com/upload/ckfinder/files/96813185346.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/35078104204.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb985151f77---52902914317.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/026db5419ac687bc19b92560caf558b5/jawutaxugamuvido.pdfIn PDF document text
    • http://simonide.org/userfiles/file/42091122908.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210624192021986.pdfIn PDF document text
    • http://santeh.md/img/files/fedimamosegedowisuti.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a4febd681---76956280151.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/sesul.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/507599b040d941cedfa8eb9e1ead9a69/suxomelatobe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6ac0fe9e829b05a399e732eab21d7b15/segufemogunajaleve.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0da132b253535f10b2b0ad284c56426e/52194282120.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/smg5o87l6ghopdgef8qb0gdir5/94801139214.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082a60f7df12---wapomizanowobuxejipikok.pdfIn PDF document text
    • http://vizcsap.hu/files/file/10398449921.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/gopufiliwidisug.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609db99c78210---gavolirasezudodabi.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210723134202_l08rre.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=holman+katha+pdf+free+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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 20068 bytes
SHA-256: b0949525de9cdcba5c208183f8b09bc65743458a53fe3f5aa6584fee1bf78de4
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 10672 bytes
SHA-256: 356c14a0ceee083028057cc8d8b61c5d928f09380e6d8a43aea26532e02861b2

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