Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bca30b5282a1174…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4dd4f176ed0f8ef69a094b265b092204 SHA-1: 9aab8e23306a7c22a87cc6058799943edda7fab8 SHA-256: 4bca30b5282a1174363c8cda6c037571ed7c5899bf295da31b185bbb05abac92
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting further supports a malicious intent, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/gogek.pdf In PDF document text
    • https://sinhadventure.com/uploads/file/29214175601.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/68026868279.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/47704745637.pdfIn PDF document text
    • http://fitviewer.de/files/file/29557967884.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/rolabule.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f064ae0974---29479191829.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/mavevigizox.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/lobiwawovovaxupeberoletat.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/51713334492.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca8f7de19---98602418072.pdfIn PDF document text
    • http://chikatere.com/Upload/files/7924702110.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/fakokaneluporavaxizafoxu.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/27585938793.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a7e479f9---10201504802.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea9245824---lafomuberebufibuximij.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105181907.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/fupemawemululajuje.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/84956704191.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a9556b9e---gudepesuk.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607015a60bd11---najisevadi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/zejerebux.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091b353cb0b4---xewasuvidebosukato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dataton+watchout+5+manualPDF 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_off0000b7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B4 17828 bytes
SHA-256: d5c2e389341d935d3c435ca2db85f6bfe00f76cbd21d0975a3e14c0dca679b1c
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 10324 bytes
SHA-256: ef978f31128e3c2e4a0f0c8a6bf2d4b233e2d085237360ecaf5b9c4dcd8cbfa2
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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