Malicious PDF — malware analysis report

Static analysis result for SHA-256 e688a89a3d773a27…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 06:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a326b6297131bf1876de8c8f3259139b SHA-1: 3500bb08ff881432c84826484920753a78e55832 SHA-256: e688a89a3d773a27434faed58a717c00ee510b0420d0665cc340b6803af9858c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=how+long+can+raw+chicken+sit+out+at+room+temp PDF link annotation
    • http://wtmongolia.com/materials/file/rezirozubasixojunoroti.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/mokejanenezibateguf.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/64192170986.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/doleronudifadulaxawowigu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e336753efe---metafutiwulune.pdfIn PDF document text
    • https://ibericadearmerias.com/file/sefepafofetafu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143d0063bf3d---zaxivavuladasatepi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/09432ccfa08d96303e72800be5d43272/gewunodinegukefigekupika.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/84260123848.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109201544268827.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/kogozalelu.pdfIn PDF document text
    • http://kite-surf.sk/files/bulokoxelokosotomo.pdfIn PDF document text
    • http://theponghop.com/upload/files/55646603484.pdfIn PDF document text
    • https://phukienbep.net/media/files/gonivoruwixu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a6710ca7---dobosibigigobij.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/murum.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/74818227473.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/netefes.pdfIn PDF document text
    • https://cubic.is/userfiles/file/44195920722.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xanugifogutifepesofiv.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/66625282110.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/2798626849.pdfIn PDF document text
    • 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_off0000ae35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE35 16276 bytes
SHA-256: 1198be57255ddea5871afbc805a5ef6af620fad0a6041565aa1222e39c117f6d
font_01_sfnt_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 11092 bytes
SHA-256: 580b9343012d9adcdaf2e2e9e1f2a2754a446e1d7e8216e999bccbed598e7a34
font_02_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1