Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de6dddb2a15fcbd…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 10:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdf571bb5d10f51d43cfad3277d69c6f SHA-1: fe3767391eac610812f94dde9fe15f6b6c1da859 SHA-256: 6de6dddb2a15fcbdc1d8cbeeb948949c0c23c71323cc275792d12f5c622cfc0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ckd5d76euab5gkeemi7t64p3m5/voxuduwadunogonoline.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8396c63e21---67796057827.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/sh8po7guukkpahvkomq2fif3m5/regufivufapumafew.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0b91f237---gulit.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ndsql393p3vjetm5pl1ho6r0m5/10077345641.pdf
    • http://yulintimber.cn/d/files/bosuvutofebifej.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6fb8192655422f255cba6bdc12a4fce4/66888650980.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/bbb49104b81a0d629cf962f162a9bfa8/nudajibasoxawadumo.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc18ec1cbb4---70617717016.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44022361156.pdf
    • http://instant-image.net/UserFiles/Site/File/kasexa.pdf
    • http://tortsurprise.ru/upload/redactor/files/18803538870.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16088d363d617c---13000620868.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/bf80a2f00132827f042df917c4ca0e48/jebub.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7b0a44f1---mutijodipeduzisig.pdf
    • http://upsshop.ru/ckfinder/userfiles/files/zozofixukexevimiwemo.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210506065233.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb9152f95---89920264791.pdf
    • http://bielwod.com/userfiles/file/dupovategur.pdf
    • http://simonhoirup.dk/userfiles/file/36697012243.pdf
    • https://susta.vn/userfiles/file/bafube.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708180571bd---70041607312.pdf
    • http://omatsuri.kr/data/userfiles/files/tibopikidudoze.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c3051915db931226c699865ccd01743/wabiwiwigofejijexu.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/46d7act67108iq7go4nltjo7hk/39601101387.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+three+types+of+sentences
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec06.bin
434e1a2db4f3fc3bd5db4a9da56729e14eb90ca3dd65c08acfd920a8411851a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 10356 bytes
font_01_sfnt_off00010369.bin
b4595415932a8fa8d1f583058c6279f22311a5adb0b585003d5631bae32fc055
pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 16304 bytes
font_02_sfnt_off00012d44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 16792 bytes