Malicious PDF — malware analysis report

Static analysis result for SHA-256 17527ddbbd5d2fd4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 07:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 927bfb28b566b60228dcca7a3943dc1b SHA-1: 5a283bf7e24b841a612d91d4fb3f751bc60a366c SHA-256: 17527ddbbd5d2fd40ceb110ff76740c5cb8c57e8fdb040a9c778fead8f09edf8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely to redirect users to phishing sites or download further malware. The presence of external URI heuristics and link farm indicators strongly suggests a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=hate+notes+read+online+epub PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ac8d57cb803c054ee3b2ec2d99f8e8b/63290460504.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/98134927454.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/5696712947.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b04d7058a5fba8a95d141d2f451d4490/77240207092.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a8be31c28---9862628296.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/dakotufuta.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29e3834a6---rijuzo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be859ecdabd---panarak.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8eedba033---jogobibinoverutoz.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/37618951165.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/68564646910.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/68342716872.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/kalalenenisuxosilo.pdfIn PDF document text
    • http://julianina.dk/upload/file/danikefivobojumotanepuki.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fcdf8f76c7a---10465420305.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e226f370ff---80688831425.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/mofokesamatizefenajafiguz.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/40902353211.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/14154186533.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/mitiz.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jarizaxilofuto.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/90116677798.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/280751577658.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/7524222217.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/pufeduwit.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/81362052634.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_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 10616 bytes
SHA-256: 833b04985ef6034184315fe64639e48cdf9aafd821489f557ed66e372cc2f6f4
font_01_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 20252 bytes
SHA-256: efdaa01753dd05c91ec59addb2e6a20b54041c3ee243cd0e9df4b850d5378351
font_02_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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