Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be39f18e83e84b0…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 12:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d4535996340fd4eeadaaa1286acdbb5 SHA-1: b80a6c57590f022cc9baf1f9ae9641a30559e228 SHA-256: 8be39f18e83e84b01aae5cb58cb1d2d847693397399c24d398e8dad0627e50b6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, some hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=thoptv+apk+download+2021 PDF link annotation
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/27675760747.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/konopuxatobapolitaxavuz.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613124ae2d617---87214800481.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_A461A19351A0C47D.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/dopotezojadasabo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/25283819300.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613719c55bcfd---zoxiziroroliderexozek.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/51076743420.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/7840497148.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/xowepoxejatuxaju.pdfIn PDF document text
    • https://spacio.hk/attachment/file/suvifoxiseroxibuxezil.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g63e2e85ht1ihk4fotf7bjb8r4/wawonuzogonafuxijofo.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/86820068898.pdfIn PDF document text
    • http://didula.com/img/file/vunogoguvemaka.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s3cq0ejeabhr7phdb4q7h7qu8l/36251757503.pdfIn PDF document text
    • https://12waktu.com/contents/files/fujiviguzovavagobomed.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/makejedebavarazanebom.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/19489858571.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140befe9e779---51821734933.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/165b462b6c1d350676de133fcb035374/27137483488.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_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 10496 bytes
SHA-256: 3b3a21cab26604a5f510f800acda06d6d2dbd636575a4d91e74e4cbd51e61242
font_01_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 17408 bytes
SHA-256: 4d41d3abcc1c0ce9d65e9191fb27b6568a3c7123b64ba83d3be014a708faffcf
font_02_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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