Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8208341b2e7f9a…

MALICIOUS

PDF

85.0 KB Created: 2021-07-20 19:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4223481d20780f2f5e55d21c232238b SHA-1: 4e450a46d4992623b67c9fdf97c8933c9d5ff4e9 SHA-256: bc8208341b2e7f9a8a0818868c7abafbbe72332d0995077508ca0cf06e1b98e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users by directing them to external, untrusted resources.

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://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9478ba4271b4d300ddfb6df92886d131/taniwusikizijiwukitupuxa.pdf In PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/vilewedovawasev.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c2ab8787787a3acf998bd05db73dd8a5/74167945091.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/kugesojejaxekigoris.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf85a6b508.pdfIn PDF document text
    • http://esejsc.com/upload/files/juvifipuxaweb.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e728952d---busowaxezugibinuv.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210718100510_o9k6sb.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/45991307200.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e89c7b30b---tukakos.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/75853608519.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce95abbc0---rototuzojuwepopobalu.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/94918373698.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa21147ef9---jizumewifaxasev.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b04edd4ac74---29558794384.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878293e81b4---45936217178.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/67717208790.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ded903f9---37257702729.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jc6egf8p0it7rl5me2cgvaqfqf/liweninosuwi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/affeddaffe555472ed6a0333303b0f1a/77380492791.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mudavokaridobibalefeza.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d676f134---libifosevukuxat.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/471692a8d31f5c17c2db1b3fb2dce62a/zefurejojaxipilunubibupo.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/38652198831.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/didizigikudadokidet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=surface+water+quality+modeling+steven+c+chapra+pdfPDF 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_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 11656 bytes
SHA-256: 8d26605ffdeb8928cee67433f7b339183a74178b7033fcce2da1c719fbffe06e
font_02_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 16556 bytes
SHA-256: 928dd09066d9da8e38f421be8b8bde27319b2eb96449482657dd6fa5cf9d1f93