Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71cabd6c732ac1b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 14:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 094599e3863df7336f5f3a1c5e28d292 SHA-1: 9b3c770c8ebeb92bc3bddf2a736d94c322fcde33 SHA-256: e71cabd6c732ac1b80966793fed974e7425f5b89298c6897d0a89b6ba4365a17
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://happy-playground.gr/uploads/_uploads/files/95976897028.pdf In PDF document text
    • http://saeronbio.com/userData/board/file/21714810894.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/sugobanimatagibi.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/giteme.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/74d86a23eca1bba74581eb26e0466ee5/77817288451.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/fozuzimejos.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/87615042739.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130534c80331---19615459436.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905101903214.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/78334146725.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161348cbcde3d6---wisabuw.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a69f4837ce---23771058678.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/71065019380.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/vipaziwufimuf.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///11226112298.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/mawasekuker.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/93404371838.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/nipugonuvo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613520cd25a9c---mudodubegosaligivopubame.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b573aeb3dc---14265423742.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/37449193044.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/vurarukemogezijixabox.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100354217957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chi%27s+sweet+home+pdfPDF 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_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 19816 bytes
SHA-256: 58268ad7c12313c5bad0384bf180f9ce954566d5313b22b2407969c77d9c04fb
font_01_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 10500 bytes
SHA-256: 5468bc1cafcb8ccd4a4fe9493c8dd999b6e4558b6b7dcd41d82cd2b0752087af

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