Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b27f2cf1bcfa82e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 09:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f2bf0960bb7ed7d75c2a20480bfc506 SHA-1: e1f03119e5956d3cf1dd916c7f9650641c1a35a1 SHA-256: 5b27f2cf1bcfa82ef957238e0954d7c2571b80a1c4122ef3f0e7ea5a5da8abc4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cleanenergy.mn/uploads/files/moxuxemesegefagokozuzuxep.pdf In PDF document text
    • https://fajndoktor.cz/images/file/files/wofariferarokufez.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/33113777357.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b290951b0a3---gozobeke.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/21fn64hva1l03f40qamn60c9vo/darelesetuled.pdfIn PDF document text
    • https://europartner2.pl/uploads/99316333889.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05bbb64bd---47834812801.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/77792691843.pdfIn PDF document text
    • https://chptravel.ir/data/file/45331996980.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/14deb4726c34e9e62f06b5c3f94e8fb2/78320550801.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a60061aa634---jenakadojanokalemijosaju.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5287b4755---73358701321.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/vunikazitarofikovezo.pdfIn PDF document text
    • https://wonkingchina.com/d/files/27023778375.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/salulo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ras31bbnmkdovv7suu30csmqqf/1116877327.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/58341419219.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/vigemotevuzamoj.pdfIn PDF document text
    • http://mesterek.net/tmp/tuliramuzepewujot.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/48663544006.pdfIn PDF document text
    • http://calisnt.com/uploads/files/78471397471.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/225ef0f0eeeb8f1d6a51646e6c6fea79/51175839076.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ipn1emml5ie3lvnit1p9ok82k/nipomiwivigikugekofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=megger+mrct+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_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 17832 bytes
SHA-256: 6ae7d0c0a10671fb83e9e093f33f7fdf1b830851bc8f2370ca98325edb0cda7f
font_01_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 10264 bytes
SHA-256: c0ce4f4dda779ae0d55ec6ff372e22b0ae203e7cd46abba5861308977b38c1c5
font_02_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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