Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52e6d11beff55cb…

MALICIOUS

PDF

84.2 KB Created: 2021-07-19 07:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82f02889164c6dfdc8d7128343829417 SHA-1: 2be454009ca75373875ec49e7954106c606ad005 SHA-256: b52e6d11beff55cb9a66afe363940f4e4837f1db4ac061b7d9cf496c693c8e7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the download or execution of a secondary payload, while the link farm suggests an attempt to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://alatheir.com/atheirwsfiles/file/29926290734.pdf In PDF document text
    • https://mszukam.pl/dat//file/93133145559.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160752dde71239---zepusabokogawapazuwuvuku.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/nagapesawiz.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e8e49d11391b873ec3dcbe8d243fd38b/92375136451.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab503a68bdf---48194362626.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/rizumadawatima.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/dedamodibodibedoli.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/63052537677.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608855b494369---metemaweti.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/83d6290f4723e1fe564233722f4e3d81/pefexafure.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/97732672914.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d649701d.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab4f1b80f---lupenoviwagifolevoduji.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/beraxazufapetex.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dktt7lkfucou0l5o3o4t4nj0i6/dewufegazavafima.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3cbf6861ba19e3cdaed6343ec7f6b92b/bulawefetusidosivadezowub.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac0fa7aad---12094784391.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e678eed3---93507582260.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e284ab7bfba---xomerukuwos.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/tilefuwuf.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/niluzomug.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ffc4e01c---gekubogegepawun.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/97419892563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+coloring+pages+mario+brothersPDF 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_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 17132 bytes
SHA-256: 539a0cbbe365afb5be76dc84ef74a2054844e6195ddfd10675a0f0a85acd2e40
font_01_sfnt_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 10940 bytes
SHA-256: 8612f0f3aa2c1c8cd7f608e6da5f7f6609559c03ad10a066e2386cf24da7f25b

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