Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11cb9e699e4ae6a…

MALICIOUS

PDF

97.1 KB Created: 2021-07-13 19:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d85a9f2f359e9e1127fc792f066b8126 SHA-1: 7052def630855da52ccb1dbf73797771ab67a19d SHA-256: a11cb9e699e4ae6ac9fba7cfbe5cd35c0dd541dec085c20a2f36edf0193dfc13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the link farm and the detection suggest it's part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/mjilip9960asvv2jf710trfn60/1696813625.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/i7usi8kfguimh21q9i87p276e3/85379682849.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/luwuvuxijalezudiwewej.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/30595642617.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/5agmenjs2s4gr2vkq0jqld3elo/jomadapaxake.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/45434616373.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//67797723767.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/73914736591.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/71119897a304c39a19fa86ca0fefde8e/zosalavorajoluvakales.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8s40rr7q8p8m45701gqrragke8/29110205716.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/19049433850.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5a75356b---wukesoxagiwuf.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30567ac87---togulobivadezofajiw.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/93334962863.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5fc7d13dfe0d79570179abebb108b9e5/ledam.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/24023040283.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b97236fa5f8164b025ab56a098976403/finifudi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160964d9d32da4---pebubo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef8b0498c2628329609f17e9cb53078b/dubedujazukeraf.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4qgb0qd27u0ra0mmkqk8k47i71/juxadezizudutojixiderivod.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607758ff2f3df---51879854255.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608681ae725aa---jalurem.pdfIn PDF document text
    • http://soupworld.de/upload/file/lofiredofofaxuturorokij.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df07536063---pojifu.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/73437671712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=destiny+2+ps4+mouse+and+keyboard+2020PDF 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_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 18196 bytes
SHA-256: f74e10ed6860716c0a79631b7d7a087b26d6eef9e0b5cf294cc2cc094c58e64c
font_01_sfnt_off00014486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14486 11272 bytes
SHA-256: f7f2940a9f8db28f4fd4e20658b793e80c20ced72bb3a61cca2066b20703aa59
font_02_sfnt_off00015edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1