Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0e800157bda307…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 03:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4479aadfb351ea48d31f32d83cfb9cf SHA-1: d7eb4b17b10ceeae7c947a462f83aa872e4cf76d SHA-256: dd0e800157bda307c5d449a0089f4023da0931b46f894e7a8469b358caf7710a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content. No scripts were extracted, but the presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/47226493143.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd03d972d06---nofetav.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56764456479.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e1d6db0b---75822533598.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/99886099797.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6fe086aae---96296364710.pdfIn PDF document text
    • https://thechoose.it/file/46198135290.pdfIn PDF document text
    • https://sce.tw/uploads/files/60df830d15eb0.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/72952545876.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/97063126848.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/mapirisewikesofozogu.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/8620792091.pdfIn PDF document text
    • https://shopabrang.com/images/files/fufovusuretir.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890528c6a78---bawobezigalumipo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wirebasuvonesitozufowogat.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/megakavemuzisem.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/352b9ba9b3d538bd772233a5bcd01324/tokokimenexomuxodimopa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf31eb23f---34591494440.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/rajemamesopu.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/xamelanijotikojuzozuziner.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c55ba4a8---48609317592.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/3279501436.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/81584093673.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b2b4a816d---94006209581.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/23024745155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=animals+that+eat+meat+and+vegetablesPDF 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_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 10664 bytes
SHA-256: eaee7150dbd464b6d73d80849abeefa5b04a2ae25df0b82e72ec6862f6d05854
font_01_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 17924 bytes
SHA-256: 12850205e9d02275c2fac085c75bd99e7963d75e65b8db8f6d08ddee038ba2ad
font_02_sfnt_off00011bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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