Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff51d0696147429…

MALICIOUS

PDF

96.2 KB Created: 2021-08-17 12:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 170e12f53de60866e31117410b1da6f0 SHA-1: e59d4b406f5bba60af6aac4cf7e1b2d25cd74d02 SHA-256: 5ff51d06961474293440927ef90f2bb145ddecb66f029dda46909554e7a21c2b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a potential phishing lure designed to track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=night+owls+de+jenn+bennett+summary PDF link annotation
    • https://ferdavagnar.is/images/fck/file/38176810207.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/94910bfe81ea833104712d824cff457e/kojomizekituna.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/76068182762.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9289523cc---82537689915.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sipukujofafu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/retixaxejasogutazufika.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/14773294604.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/22319350740.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086766a825f9---80604182356.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210601073634114.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/877b781ac07c8f29ec39171c7611fb93/xozij.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811e9e88ce---51732878997.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af8574f59---2376585286.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6e5a36435---91139090675.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7de4a182---8837451020.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc68cbb7f0---91940013892.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7791f94c9e---nemojin.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/wireluzixenukitaxopi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3411cb615a147011c43696282d5e1e14/rilurigovupiwatopebave.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/84d2ac2b99cb91e3b6ef1c71d9cdeb54/zopimonajowesufijar.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kakererenatereto.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/94858532492.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/83404506209.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_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE3 17584 bytes
SHA-256: 1a1e96bdda08896735dbd65f9d2108e6e8dbc708ccf30ff92c64b14c1efe84d7
font_02_sfnt_off00015731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15731 11240 bytes
SHA-256: f8b6f02f81c8c5b83d43d8fde6dfaae4616a4738739827f5baf430cd57c3db98

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