Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6da8d916f65bfc…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 09:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75af3a218bec1dacd3abbd2a30bf6734 SHA-1: 6e5ee5f8d497a1df346914bee1bb283290df8019 SHA-256: 8b6da8d916f65bfcc2d278494689a0335175d8136f194328ee2da8c386937657
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://rabudiagnostic.com/userfiles/files/11385270304.pdf In PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff9675f43---81725352643.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68605896855.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/fb34b9a130714589130124fc4c312d5f/25181366826.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/20336148308.pdfIn PDF document text
    • https://nada70.org/userfiles/file/75426635285.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/vibamokawinuxokidekovu.pdfIn PDF document text
    • http://berbun.com/user_img/file/53661505091.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6d7a91c824626b80f4f1537119d78b7e/85724145417.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626cce1349---gawenanupekizomanezijulo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/2a0c97aa90f39dd300ebf3f5608345f5/xeforipibelasezejop.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gimatasepali.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077fdf0be998---dafatebezu.pdfIn PDF document text
    • http://hybsch.it/upload/file/95383780860.pdfIn PDF document text
    • https://badoza.net/userfiles/file/26600197356.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb30372fc---kivikebakunexuvufiwuwowi.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/65919841258.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8dca65923---68962130923.pdfIn PDF document text
    • http://mosjob.ru/images/file/9583139355.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d124166852---duxeroxaxigejikov.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/zutovadapajili.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/73338127337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pang+uri+at+pang+abay+worksheetPDF 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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 16460 bytes
SHA-256: cb0933c6200d231512dbbede3bde9e8a100de0377bcc4dac5b1af2a1a068e47c
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 11016 bytes
SHA-256: 02fa783ad6d9d252d7121cea7de3126c98651056e18a4e78d5c26a4d2b05fd88
font_02_sfnt_off00011ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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