Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50ed3f0e0e55506…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 20:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9360997cf2f0f984f3c38afb9662415a SHA-1: 64f3edb2ba34e96f83eaf7d6f1b60b9d37c9115e SHA-256: d50ed3f0e0e5550659db013b11f94cdb49c2724cbb9b2188122d6b40b1c2e33a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, several of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://strechybenesov.cz/content/kiruzodab.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qdj25f780o8kr5uei9ra0irmat/17565346988.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/43682134087.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/61366899505.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300f4a7081---jumumiwutebevumu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b686c10557---danavisukapomep.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93eca1360---84782031689.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/64728407390.pdfIn PDF document text
    • https://fong-cai.com/upload/files/weguxabigumelapetezaliti.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/vakofamuvipi.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/92166562236.pdfIn PDF document text
    • http://dentistturkey.com/image/files/duwejokufagavixezefubugi.pdfIn PDF document text
    • http://blueyee.com/upload/file/251741523830.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/185s6lp9cnauk0vmkuvif80mbv/32611935478.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/46297841222.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/52200178851.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/rezifomelugufitoxa.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8db4a7f77880c3556586829ad1b61e96/wekefofiniwuvi.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/84410173468.pdfIn PDF document text
    • http://simoncaulkin.com/images/magolukimimowudas.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/fefusigude.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/53a244df2253e133e26cbfca1c352701/tumezagupi.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/56680774628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=psychology+schedules+of+reinforcement+worksheetPDF 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_off0000c5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 16356 bytes
SHA-256: 4a4b147f64015e474ec09b66000f2725a8754f848e44a540b305f195ce6c705e
font_02_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 11152 bytes
SHA-256: bd4de3f67b48c00474f0a4220071f13c3cebe97fecec06cb2ff6a4e753ffd70b

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