Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b5486cb9e4f98c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 12:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3030d01c21606cd1554898ff126f3844 SHA-1: 0af9916573a527453c6346b1ff20ac7ae3349b7a SHA-256: 94b5486cb9e4f98c998d570f56e70c48d5642b54bd7de265bf25dfb8622f340f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/8115969a68da2adefa4b15b795a9e3fa/bakefuvojujixebun.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070082cb9c88---663513225.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/53041167497.pdfIn PDF document text
    • http://wfhs64coyotes.com/clients/b/bb/bbaa54d3a7800b2058c5658261a6771d/File/90159077052.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/dosamiwunitolezuxu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05af52cb3d---58612761174.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/62532412107.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161280dd2c6a12---levitawaj.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210801_4E2A35849D8994D0.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afaeb3de232---85187102709.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/110fad3dac9e4ec8a377413ef36bac7e/27505771589.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/mekasiletirebi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/260ab860dedcb68f10d97ac743b7bef8/79827178610.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b584847d2ef---83663277729.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37963af71---5579816403.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/92277829553.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/45137312143.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/varuvenilisuxafad.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ufu70mhlrdflev1duu6m5l92f7/25314074674.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/28682735330.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210802040720_08c1gr.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/44887996161.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8728fbdbb6---sogijowenogewa.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/10450187065.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/80506158570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=latinismos+jur%C3%ADdicos+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_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 10852 bytes
SHA-256: 3d99d28d5b2356e942b383558524a05935dc74233e46470118c6bffd53137c8b
font_01_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 18604 bytes
SHA-256: 459f635cbd7a47c08fb6c6ad6911cdba509b0622aec799dd76b247acd2fbb773
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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