Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab6453a601cf0c4…

MALICIOUS

PDF

87.4 KB Created: 2021-07-18 10:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 953c8c585db3d3496bf6dd092bf5f31d SHA-1: 1d9af014613d4612c6b692652edef80a34f35958 SHA-256: 5ab6453a601cf0c47f0c097864acc390c4848b1020e01318857b5c547903c533
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites used for hosting malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to manipulate search engine results for potentially malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445fd082a4---namofonemuganuwa.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6e74b04f---gogumovajoziganof.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f4daa92da---12532317522.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/kekol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4393e8f240---luvonudasuwirititafomi.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/suvolabozavat.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/07b8632066d01976061058f298611ad0/nawobidomizi.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/14740403794.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/56133597376.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609793e74a535---69974686829.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/livinobuvixe.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608961c719372---gazom.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jibipositabat.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47ac93815---jaduxijanuvewa.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc847ca0fc---favezowu.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/5817882153.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc34e3d05b---laroduxusewitisi.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e0a5814f413d4ab70ca1a2ab1a854af0/88347123817.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c77823490---vawadepafa.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780425ad454---virugotilovobepozexime.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1a53a0f0---gekolarokenobekujawez.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/rusames.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=plant+cells+have+lysosomesPDF 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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 17684 bytes
SHA-256: 46a2df098a5dc218d753b0063cb1aa120c125123ffb9c337b981a50a34bbf30d
font_02_sfnt_off000138ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CA 10484 bytes
SHA-256: 9bd8dda4e6e5a8f4d56c9b6c8c2524dc590ca19064523f99518fe073273ab6f7

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