Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e0cde4880373d5…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 22:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15b083b1690fbfbf031898bc9ffc0588 SHA-1: 50de1e288b8f8551e2ca233e57ca61afa40883f8 SHA-256: 29e0cde4880373d5215a5a6d212e12fae532e1ab6a8696293ef45ea732a1a959
172 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload directories, likely serving as a lure for users to download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deborahkay.com/ckfinder/userfiles/files/ridewasiboru.pdf In PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ms49mucslski8l6m6fnvout4p6/mabulitabidigavojew.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc1cf16d66---nelogipowewobaziwitasi.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/95760646166.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd15e8a96a---8197348172.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f43feb516---banobegebevekoruboj.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608371528efe0---35400257791.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/wowesofizuruwodowanotak.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/14861663410.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/zufapoxe.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d647793fdb0---47168802587.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080e005077ce---wodawunajugiwafitape.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2787d6a892a460671021a423529d932b/gewovixuf.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/67416315038.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/noloronatuk.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/9046164153.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/54966816517.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee95b95cd1---42474191148.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7efa76d37---dobadijufojobedi.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/35521813604.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4b23722daee77206096c6b700e832635/fejopapiw.pdfIn PDF document text
    • http://landpas.pl/upload/file/puvokewofevukokim.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3au6p0lv3budv9hrrktqrt8rv1/45101057320.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/neludolodesobunabubosa.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077b18ab2f02---55761314510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=transportation+engineering+1+book+pdf+downloadPDF 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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 17200 bytes
SHA-256: 7b851e2f4bbf2e1a49fda4441c201781c2d22262ae53c8b5f7dd0a799218ba15
font_01_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 11008 bytes
SHA-256: fb066146d9488bde50ad0148fcd5aa606726904c25afba4eecd095efd2c5cda3

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