Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1d261e571d4dba…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 10:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21d6beee6875e73d449a6157d03a5bd4 SHA-1: 795fa1ae9021c88531db93c6dadb5584f1dc1392 SHA-256: cd1d261e571d4dba87ee4f310104ba6e4bdb5c824dd94ad658c5f623f046f1ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to download files from compromised WordPress sites and disposable hosting, disguised as psychology tests. The embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into downloading and executing a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=psychology+tests+pdf PDF link annotation
    • http://zjqzzx.com/uploadfile/file/2021081310022673499.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798afb9b829---tamotigelekuralakanozu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613171aa2d357---10863981947.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezijigimisok.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zujixegimugexigot.pdfIn PDF document text
    • http://22743333.com/userfiles/files/gijunixuxajikizudiwin.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/wadamuwareb.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/45534889892.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/suxoluzakeduke.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/78675296246.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/genutuweza.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/4879853601.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9802166a---guvixasikorinekomabako.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/gamitoxibivepi.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/minugejaviboxosolexarata.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/tiranawixi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/rugepibol.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/nasivemabuke.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/nitabavakunawabegipu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160881bbe15653---73443898903.pdfIn PDF document text
    • http://www.heksan.com.pl/file/84123184005.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/xofijiza.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210603041023_659189068.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f422443---zusek.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/10233758323.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_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 17144 bytes
SHA-256: 0bfa8b91ed38b4f8c22a7172441e563c7268f591c45a452ce6516115c12637d2
font_01_sfnt_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 10556 bytes
SHA-256: c7c8fc69403821d3c058c445de4d2698153a19dbbe4ccd5efe621a6d8180b6a6

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