Malicious PDF — malware analysis report

Static analysis result for SHA-256 866a72d618d65bc8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 21:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b82fc814443565a4ac09f07d2400c4d SHA-1: 77d6dfeb9686ec3a37cd14e6194eb96ef4c375f1 SHA-256: 866a72d618d65bc83a7209871983cea1a13ac9de972f054b319bfe66ea8df659
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://djennebeads.com/nbloom/fckuploads/file/dilikozafo.pdf In PDF document text
    • https://projetounificado.com/uploads/files/62425952719.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/nakufape.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/4426494354.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vepabotikinovitanujilaz.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5c30c792efa09b82aebb719ea35bd6c6/6182505039.pdfIn PDF document text
    • http://oris-am.com/editor_up/voxanof.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/xitusemubosidinazofez.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/t77vf5pq5pgah96528i92g059g/wonigofo.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83602579592.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210908_356B1B1BA8D6A5F0.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/tamepureranimizugigoturig.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614209f729f6b---daxuvuva.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/degonigodid.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090309584073499.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb21c535a---senopumaxed.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/73975928272.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/detuwizikivewarujixixe.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/wipaxazavaragomalaruzin.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/minizerapunelip.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/jazonatixowomunizozikosu.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/denelujaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+tcg+online+for+androidPDF 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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 17560 bytes
SHA-256: 010b9da0b8585f894dce82f852f9722e7256b68de40e5409fa338cd60e6ad0f5
font_01_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 10744 bytes
SHA-256: 46d7923d3eeb5dd75226be2209a2d7f6a8376ebcc8bb0dfd033e219aae95d721
font_02_sfnt_off00011f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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