Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc12e61d7444805…

MALICIOUS

PDF

85.8 KB Created: 2021-09-10 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 221946bb0cfadf2db547070b6e66b03f SHA-1: 2584cd15a4f1655ee1461247f073b7727c12cfcc SHA-256: cbc12e61d7444805adb61f375b0b147e63c385725a4596b89dcf3ab2e430a807
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aranysolyomfeszke.hu/editor_up/19894190372.pdf In PDF document text
    • https://revive.fashion/upload/files/40764514618.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c4b28da1---93893178581.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/57834175415.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/96610796182.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138215943463---zamolobudat.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/98167899762.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2a24a970d1aca0d4f8ae649c1eb91031/79511079891.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/zagosabidedisi.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/siposegigiku.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zavarenobibezabawunaforuv.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/43923068896.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/58701247324.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c7dccaf3---voxejap.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/51510774025.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/79696382817.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/gijexuginawasanovopa.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/futike.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9c4a08cb---67305373121.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/96267344297.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/60279849496.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/92682195615.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021941943134569.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/75793855966.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/masuwub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=final+fantasy+type+0+ppssppPDF 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_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 22936 bytes
SHA-256: 46eff4b12a0007cbd948cb6c64d4da62b77e210cc93cbde20118b9814eaa1b0f
font_01_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 10344 bytes
SHA-256: b055f5e0027839f6c44ae74a62d01503e0411695bca8124bb69a384b4024c7cb
font_02_sfnt_off000131a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1