Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b53ff707738151…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 05:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b675c6f191b65d819340cdc3b804f348 SHA-1: df548a441b7a39dc79f3631ca81d2b60e020d726 SHA-256: 24b53ff707738151d4bae8d6113d8f1c7d8fe8260d1bcba6e3598cb4ba7309c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple external URLs hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bwawarszawa.pl/upload/file/zidowuneteg.pdf In PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/6119819959.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d5a328a4e---44348123414.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/79534195860.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/886524f60f1841b94a175bb5445cf7d7/8890115693.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd5a85a5ef---17685433365.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2ed305a5d---29222178374.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b68d4e057---fimomaledobija.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/69312776879.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/pevotovexogapemude.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/94160507353.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/38075658712.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/tijanokuvek.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607989a7eb15d---dapulemapefam.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210618083659.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/62170627696.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16123a9f040da8---12854332779.pdfIn PDF document text
    • https://ottopianos.nl/files/migaxaxusidawuvedido.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3b74c6098cd8b1a284422152ae8ec5dd/juruxetunirixegizot.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/14890773288.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802f2119ce---78476737882.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/gowolixoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=citizen+kane+analysis+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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 18956 bytes
SHA-256: fd59b5269b062f0c55c92f04c5e200edee271c6b9321c0f96204adbe568e7dce
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 10568 bytes
SHA-256: 100d4b3d04068599d60bb3754a2f230a6d0c5c8c317e30b6dc294e6f2b3bc421
font_02_sfnt_off000135b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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