Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04b14024dafdf47…

MALICIOUS

PDF

90.2 KB Created: 2021-07-08 14:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8d20ea0802dbee707bfcac2adb328f05 SHA-1: b623aa1f36857410140751ee8d8b5b43321c85ca SHA-256: d04b14024dafdf47025bf9074c2cf2d96681652b70a8e9c7ea414139ff8a6972
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malware or phishing content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://brickchamber.com/ckfinder/userfiles/files/kajonujube.pdf In PDF document text
    • http://soflocops.com/clients/67403/File/gabotugatigumawile.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/80852938158.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2317d01092fe7ed02ba7471e144df931/dotibisavaz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9c023871a343643dc8f4e2a9d8989f0b/27894490986.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/vuvajuwedejunigevupab.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2543d72407---86157706993.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/32533693711.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda887e58d2---xalijilalixi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ce57835a4e4c637b60659555de8eacd2/nowaravumerefavit.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/bigemudoselimewisigudapas.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608443c775d58---dekuzimoligavinexib.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf964dae398---47129255619.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf48e797e1---dawuzabolutotil.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8813a83bb---bewawobegivagiwetirij.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/78742233319.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/zuzelepuzisoxifizel.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/rilopufekoniw.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/el8splpmhqtn6oigam4f7j8o45/90449899280.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be17c97ca92---daxesotarafitofugudadojex.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/60622547349.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fe050e7b76c9f7b8162534920cdfaafc/99698659729.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f65e2757a12f6bf0fe5fcb00ea528ca0/mizamugekitepem.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3af70c78---tukegorolibuwo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c83b89d72---22890494441.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceeca720fa1---begalezutopazajup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=family+first+photoelectric+smoke+alarm+manualPDF 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_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 17476 bytes
SHA-256: 7b9980ed2ae5593856fb229f17982a8863e584da566af05364a23c459cbdb696
font_01_sfnt_off000129b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 11028 bytes
SHA-256: 66e99d23c9beaeb6e68ae0a0002483634996eb32ff039fd27069a210eedbccbd