Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c18c66288e8d1f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 14:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2e60a9c1a6d3c447b9c9a773230d375 SHA-1: 785603f32ebc5a710fe1b3e7123b40485073fcac SHA-256: 20c18c66288e8d1fbadf285bf78fb29e03e1bccbc9eff163d94b66ea8213fdef
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF files within the URLs indicates a potential multi-stage redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=importar+planilha+excel+para+pdf PDF link annotation
    • https://eatorhours.org/e-bussiness/fckimages/file/52261357338.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6f866911---tugese.pdfIn PDF document text
    • http://ombs.ru/uploads/files/58060139663.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/14315bdf2a8adbe174f6a65262e0e7b1/litin.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/mamaxatu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a93b62fc8ab6a65629113a1f45eb84e9/87196471259.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a146793162d07b5948d5c64b2c58f627/makarukilala.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4894501289802458065745f42fa46369/lazuxewexubipu.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/44065493627.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/vujomebezub.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/32958725995.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/kf9oi7b406drvmjvne0pb8j414/zunaso.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e4b8d726a---68325855912.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/65381407141.pdfIn PDF document text
    • http://linza-market.ru/upload/files/91868277140.pdfIn PDF document text
    • http://autovoda.ru/upload/files/77143567719.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5d5c018f5---sojatefirefogotojigetezen.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jusipewutukusalokafito.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/puxifike.pdfIn PDF document text
    • http://wernitznigg.at/files/65545921355.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/vazedibo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b67b16f4a---tobumetipu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d89417ea448---wujaj.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2f1b91a88715179ff1117566645f2bf4/debetegakopezixesijoke.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607249921f0e2---34832842200.pdfIn PDF document text
    • 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_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 10772 bytes
SHA-256: 9ce4af808fd89c4050f003fa2b8a6ff1d34464ce57fbf9e5efb8657ecb3f7ad0
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 19768 bytes
SHA-256: 18413893424a4b22e1e6f82434f9c28377b346b817cfe60114a4f721e4e7288a

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