Malicious PDF — malware analysis report

Static analysis result for SHA-256 b428dea138d49862…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 05:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d636a6b458085f786bdf17ff13a1075a SHA-1: 87a2e715ee9a5ee6de90641d51e2c71919eb3722 SHA-256: b428dea138d49862544e5e2c065c9d663c8d1554d9b65153c2e2404ae3dc6a22
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cambodiadriverservice.com/userfiles/file/labixedafiwugadegipebigo.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130d252c5277---buloxujerazunekatup.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/2957925572.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/xusonumijiv.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/25414227389.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161396b2a28c7d---gikaw.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/sosulepapeputexa.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/10901030400.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d7921a9d5---detagemagafuvipobexum.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/51174505053.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fab86429862f0eac10d403219d4ec6d1/76035425280.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/ponekip.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/sekegusonitemosulasa.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912103142.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pulawoxe.pdfIn PDF document text
    • http://4darchitecture.org/img/all/gajidonolutapujokewugob.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2214405d4---97412475965.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/xowezuladiziribabejiw.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/jodasenibe.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/5608109769.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/43916aa31cc13efa07f2810caf168a7f/pesubizajuf.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/furogilijoz.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/80662415888.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/4700246136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+weather+widget+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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 17820 bytes
SHA-256: deda810deb21603225e2afa8e63257c4a31b2d55b2871444bd52fa7c79f0d79d
font_01_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 10620 bytes
SHA-256: ad79b980ddfcf40f3c7010bcae7438a689e308029653676bf614407fb80e71cf
font_02_sfnt_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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