Malicious PDF — malware analysis report

Static analysis result for SHA-256 689c7f71b74876f6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 18:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dab19477128b3ec5e7f5d91810e42987 SHA-1: f9ce4e60a18f3a620233dc68208364532aeced3e SHA-256: 689c7f71b74876f623465db03788a193a19b6ab3e164d8f0808191470fcdd6f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://sys-svinding.dk/userfiles/file/10080648060.pdf In PDF document text
    • https://bisnismedsos.com/userfiles/file/pirekezufuvetozewil.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/bibex.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/99415643455.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/322838524.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0b148a3d120912331f1975cc6456a12c/minifowuzakakugob.pdfIn PDF document text
    • http://rilta.net/userfiles/files/kejogojoboxajexezumupu.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/90481180890.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1ac3a935---kefikobokemasutunoruwamax.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/tarinilezafaguwoparibalu.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/28506953184.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904202842_1263962218.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f945217474---zepom.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b32f42a44---tepupo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/64050694326.pdfIn PDF document text
    • https://expomediainc.com/upload/file/56508627896.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/dejuvotomi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/98290e72af609b425e6a74b1bdc09818/fibudimilisajulip.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xiwazadelipuki.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/76367562101.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/sudesuzewurid.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/66804448790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=zack+snyder+cut+watch+onlinePDF 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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10820 bytes
SHA-256: ad8bd7a421a20974048e683ad7ae9a681c00ecebd176fc953a17e6d46199fa96
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 17212 bytes
SHA-256: 46f34af7c53181763a524d2998559ccbb52d1334129d8eff7ce83b697a936418
font_02_sfnt_off00011e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1